mjoseph67

*Update*
Called Fujifilm and the representative (who expected user error) suggested I take a series of photos on a tripod with/without AF (if the problem doesnt show up in their studio, they wil send it back & charge shipping). I took 125 shots focused dead center at infinity with/without AF (manual focus)... and the shots were perfectly clear. All 250! I noticed that, at times, I will zoom in and out while taking a photo, which, with the 16-55 WRII's rather herky-jerky zoom mechanism, could cause the blur. I am having trouble replicating it, and a tripod test with/out AF revealed clear pictures for a sequence of 250+ shots. Just info for posterity if other people report similar problems with this exact lens/body combination. I imagine any camera settings that would override a focused subject would cause blur (taking shots while AF is "hunting", etc)
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Thank you everyone for your help and direction. If anyone else has ideas I havent thought of, feel free to share.
And I have decided to send the camera in for Fujifilm to check, with an open mind that there is a natural AF keeper rate.
I love my XT5 (had it for two months) and yeah, keep shooting, folks!
[A final sample blurry photo for future folks who may experience similar issues (you will notice nothing is in focus in foreground or background) ... ]

I do not think adding this will help you much, but it may give you some perspective.
After reading your posts in this thread several times to make certain I am not missing anything, the numbers you are reporting are in line with those reported across the broad range of digital cameras by various manufacturers. Nikon, Canon, Sony, Leica, Fujifilm, etc. Use your favorite search engine to lookup (brand) af keeper rate. People are reporting af keeper rates now in the high ninety range. You will find page after page of tips and technique improvements for improving the keeper rate. As well as page after page from the manufacturers touting their new camera models with improved af keeper rates. af is vastly improved, but it still is not perfect.
It maybe that there is something slightly wrong with either your camera body or the lens, but I suspect that if you send it in to get it checked, it probably will be okay. Getting a new XH2 will make your camera dealer happy and it is a fantastic camera, but, …, getting it solely in hopes of better keeper rates is probably wishful hoping.
 For what it worth, (more of what you probably do not want to hear) back in the film days, a af keeper rate over 50% was considered great. Those expensive film rolls certainly did not hold the thousands of shots memory cards hold.
I very well understand the thought of maybe missing that one shot, try when possible to push the shutter button several times, those cards hold a lot of shots and it is easy to delete the extras.
I hope you get this resolved in a way you like.

I’ve had my X-T5 since launch and usually my missed focus shots are moving and using continuous focus.  I suppose it’s possible I’ve experienced this too but have just assumed I missed the shot or usually it’s lower light shots I notice most missed focus.  It seems like you’ve checked a lot of my thoughts that could be (release priority, AF+MF, face detection on, touch screen focus).  Do you ever half press shutter to recompose?  Could it be you half press and have slight delay before fully pressing?  Wonder if you could rent another lens and see if experience same issues.  I haven’t had my 16-55 mkii that long so I’ll watch for this more closely.  Wish I could help more. 

Had my XT5 since launch  a total joy to use

What aperture and where was the focus point?

That is typical for the X-T5, I was having a significantly worse hit rate before the last two firmware updates.
A non-moving scene with a clear, central subject, plenty of light and contrast, single point AF in S mode, completely out of focus (even though it gave focus confirmation in the viewfinder) . That was with modern lenses like the XF 18/1.4 and Viltrox AF 13/1.4. It was occurring more like one in 20 photos.
I still have wildly varaiable results with the XF 150-600 and C mode AF when shooting birds, sometimes it's better to have subject detection (bird) off, sometimes on. It's very frustrating out in the field and has lost me several lifetime opportunities.
I like the 40MP sensor and the results when it works well, but I contemplate selling the X-T5 and purchasing an X-H2S in it's place. That seems more economically sensible than a wholesale switch to another brand for bird photography.
Additionally, the recently publicised tech documents from Fuji about the AF and settings for various subjects and lens types seems to have made my X-T5 and XF 150-600mm slightly to moderately worse for bird photography.

Having had an x-t5 for several years, I can honestly say that I have absolutely never encountered this problem. The only failures I see are when tracking moving subjects and even then not often. So, in my experience, this is definitely NOT typical for the x-t5. Certainly not for static subjects at least.
Nothing to do with sharpness, but did you mean ISO 800? 80 doesn't make much sense with the x-t5. That would be within the extended range where you will get less dynamic range.
Either you are doing something wrong or there is something wrong with your camera or lens. Do you have the release/focus priority for af-s set to focus? If not that might be the problem. Also, it is not a good idea to have the face/eye detection on when there is noone in the shot.

I repeat - there is something wrong. I have the same lens and an x-t5 and do not experience any sharpness problems. It may be that there are problems with a 150-600 lens, I don't  know, but mjoseph67 is using the 16-55. Make sure the af is set to focus priority and that you do not have af with mf set (if you have you could be accidentally moving the focus ring after autofocus). If that doesn't help get your camera and lens checked out.