kerrydeare

I just learned about this forum as a source for Fujifilm system information.  As I am well known in my part of the world as an old unfriendly person with essentially nothing to offer, you may at your pleasure ignore my posts and comments.  I am here to steal valuable information, learn to see, and become proficient with Fujifilm gear. 
 
OK, now you know.

I've always been a zoom shooter but I have to say the Fuji primes are amazing.  With that having been said I do own the 18-55 (never leave home without it) and the 55-200 (almost never leave home with out it)  In order not to be redundant, in my signature block below you can see what other Fooj lenses I own.  Anyway, I considered the 16-55 2.8, and I also considered the 10-24 F4 but in the end they were too large, and too heavy for me.  After shooting for years with Nikon gear, and carrying around the Nikon trinity of lenses and some medium format gear, my personal choice was go stay light.  and that is a promise I made to myself and one I intend on keeping.  So far, it has worked out tremendously for me!!!!  I am having more fun than ever!  My images are more fluid.  Yes, I gather a ton more dust and dirt but who cares?  Nothing a good Giotto blower, or a wet cleaning can't take care of!  And knock on wood, I've yet to drop a lens so I'm not going to worry about that.  Though, with that being said on a destination wedding I shot in San Juan Puerto Rico I did manage to drop not once, but twice my D700 with the Nikon 24-70 F2.8;  Once inside the El Morro Fort on solid concrete (camera and lens still worked fine but destroyed my grip) and the second time, the next morning, shooting the "trash the dress" on the beach in wet sand (camera still worked fine).  That just happened to be the last wedding I photographed, destination or local.  Two days, 19.5 hours, heat, humidity.  Done.  Retired. Been doing weddings since the mid-eighties and I literally and figuratively retired.  Now I just shoot stock for travel and magazines/books.  Anyway, I like to keep it light now.  My two cents my friend.  Good luck on your decision.

You sound interested in a zoom. The 16-55 is a "Pro" lens like the 50-140 with its constant aperture zoom made for photographers who use a lot of manual settings. Get it, if you need that feature. Keep in mind it is the constant aperture zoom and probably faster auto-focus components that make the lens so hefty.
 
Do you have the 18-55 kit zoom? It is optically slower than the 16-55 at anything but 18 mm but also weighs under half and is smaller, especially zoomed to 55 mm. If you have the kit lens, think over what you would like it to do that it does not right now. If you do not have it, or another zoom, consider trades between the 10-24, 16-50, 16-55, 18-55, and 18-135. I do not recall any truly "bad" lens reviews for Fujifilm lenses. Whatever you decide should not become a horror story.
 
Regarding primes, I only really use fast primes wide open in poor light, though professional photographers do so to intentionally de-focus some of the image. (The wider the aperture setting, the shallower the depth of field, meaning foreground and background become more out of focus as aperture increases. Etendue can be frustratingly intractable but at least photographers seem to have fun with it.)
 
If you have not seen it, yet, look this over:
http://www.fujivsfuji.com/16-55mm-f2pt8-vs-18-55mm-f2pt8-4-vs-18-135mm-f3pt5-5pt6/

Looks to me like you were using the electronic shutter, combined with the frequency of the fluorescent light this results in only parts of the photo getting illuminated by the lights. You may prevent this either by using  lower shutter speed (<60) or the mechanical shutter.