E mount is obviously worse in the corners than X mount with Leica M glass, but it is a little soft along the edges. I see no reason why a 16mp Fuji should be any different than a 24mp. The Skopar resolves a little less detail at f/4 than the XF 23/2 at f/4 if you're into looking at your images at 100%, but it yields beautiful colour and contrast. I get clearly better results off of it than from the 23/2. It comes at roughly the same price, half the size, 10 times the mechanical quality and much better ergonomics. However, the 23/2 is a nice lens, it does auto focus and since the XP2 does AF-C now with FW3, it's still well worth having it. Below a comparison of OOC JPEGS, both at 1/2000, f/4, ISO 200: XF 23/2: 100%: 21/4: 100%: Cheers!