Sony E 10-18mm f/4 OSS vs FUJINON XF14mm f/2.8 R vs Panasonic G Vario 7-14mm f/4.0 ASPH vs Olympus M.Zuiko 9-18mm f/4.0-5.6 lens sharpness comparison at DSLR Check.

That's a whole train of wide angle mirrorless system lenses, and it seems the caboose* has derailed somehow, pretty soft and fringy compared to the other 3, BUT it was used with a GH3, not the best of combinations. Kudos to Sony to make such a sharp wideangle (used with a NEX-5R) zoom lens, they had a slow start but seem to have begun catching up by now. As for the Fujinon xf 14mm (mounted on the X-E1), it performs as expected, very sharp with no visible Chromatic Aberrations. The PanaLeica 7-14mm falls a bit behind, but it is the oldest lens of the bunch, by a wide (heh) margin. Click on the image for the full thing. For those daring enough to delve through the Google translated text, here's a snip:

"In my case because it is operating in a zoom lens basically, I likely such exportable first even buy this, because it is a super-wide-angle lens first as for FUJI X mount,14MmF2.8 R Fujinon XF it bought saw. By a comparison with the super-wide-angle lens for mirror-less machine, Sony E 10-18mm OSS, Panasonic Lumix G 7-14, and Olympus M.Zuiko Digital 9-18 is a lens that can be taken at 21mm conversion have now first Compare. In the unified machine 16M, the camera is shooting, NEX-5R, GH3 X-E1 time. It is also often compared in developing RAW and is always, in the case of the machine Fuji take in JPEG is the best almost, it is that X-E1 that disadvantage compared with Lightroom, this time as compared to JPEG on the camera (If the E-M5 and NEX-7 is ... is advantageous in terms of resolution and is inherently camera also) seen side setting JPEG are standard ones, set noise reduction to avoid lowering the resolution to reduce as much as possible, has taken in less than a super-resolution settings later in GH3. Aberration correction of the distortion correction only NEX is OFF. · NEX-5R + E 10-18 (14mm, open F4 , F5.6 , F8 ) -X-E1 + XF 14mm (14mm, open F2.8 , F4 , F5.6 ,F8 ) + Lumix G 7-GH3 -14 (10mm, open F4 , F5.6 ) M.ZD-GH3 + 9-18 (10 mm,open F4.3 , F5.6 ) But with respect to reflecting of the XF 14mm, it is well reflected in the wide-angle lens is basically . I think it is not true of one of the most commonly reflected in the wide-angle lens for APS-C. However, the open side has become a depiction inherent in wide-angle lens focal small single in Landscape periphery that sweet, this kind of nor a type of lens that sharp across from the aperture, but becomes sharper if the aperture. So, (note that in these four and it seems not even mean curvature people who have focused on the extent F5.6 depiction peripheral sweetest the XF 14mm, I take the view that looks good when compared with the value F the same ) is sharp enough, small minute sensor, if there is only a single focus still focused than M.ZD 9-18 is well reflected here (there is a limit to squeeze even more truly be narrowed down to F5.6 ) is likely to lose its resolution because there is a limit That said, also to improve the focus aberration, as compared with the Lumix G 7-14 E 10-18 and a relatively sharp from the aperture is."

*Caboose, from WikiKnowitAll: 

A caboose is a manned rail transport vehicle coupled at the end of a freight train. Cabooses were once used on nearly every freight train. Until the 1980's, laws in the United States and Canada required all freight trains to have a caboose and a full crew, for safety. Technology eventually advanced such that the railroads, in an effort to save money and reduce crew members, stated that a caboose was unnecessary and their use has since declined; they are seldom seen on trains, except on local and smaller railroads.

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