Raid one might say that, for there also is a thread for images taken with the M module, this is the wrong thread to ask
🙂 see:
http://www.rangefinderforum.com/forums/showthread.php?t=110755
It's a bit of a personal thing, but I have both the 28mm and the 50mm module and even though they both are very good I have not used them more than for 1 or 2 outings but have been using my M module pretty much exclusively. The GXR M module is optimized for rangefinder lenses and handles them very well indeed, no issues with corners and or edges with rangefinder wide angles lenses as other mirrorless cameras have. It is a joy to use and takes great pictures.
As compared to the latest and newest one may say that it is a bit outdated by now, it is slower in operation, it's EVF ( which, if you use the M module, that is manual lenses, I'd much recommend ) has quite a bit lower resolution than those of newer cameras and it's sensor has fewer MPs and less good high ISO performance. But those are about it, and they are not all that decisive: The focus peaking function for manual focusing of the GXR imo works better than that of any other mirrorless camera, at least than that of the Sonys, and that makes manual focusing just as fast and good even though the EVF has less resolution. It only goes up to ISO 3200 but that is useable. In features, customisation, handling I believe the GXR to be still unsurpassed by any other mirrorless.
( Since I own a Sony A7 I hardly have used the GXR M, but that mostly because I am too curious how my lenses look when used on a FF sensor. During day I have gone back to use the GXR M a few times, simply because it's use gives much joy and mostly I prefer the photos it takes as compared to my Sony NEX5n and A7 )