I had a similar head scratcher recently with the 15-45 and H1. For a lot of shots, it was almost impossible to figure out, where the focus actually lies when shot at around 15mm.
I came to the conclusion that it was a mix of reasons that led to blurry images even at f8+f11:
- shot against the sun (cloudy early morning) reduced (micro) contrast
- longer shutter speeds vs slightly moving foliage
- comparing jpg preview of wide angle vs narrower angles at high zoom levels in cam, ended up zooming closer for the same/a similar detail in wider angles. Shot raw+jpg and the jpgs imported from the cam show way more detail than the siblings shown in the evf and screen after shooting them. Adding higher zoom levels when looking at 15mm vs, say, 30mm didn't help either but it's a weird behaviour of mine I guess.
