I've gone through each page of this thread and to say I'm blown away by most of the images posted is an understatement. Sign me up I'm sold...well almost...and that's because of the worry regarding wide angle lens performance on the A7r.
There are times I need near optimal edge to edge sharpness at focal lengths of 18mm, 21mm and 28mm without color casts (even though there are specific ways to reduce it... and from all I've seen and read, it can be problematic with a substatial majority of lenses with these focal lengths. I've seen the Leica 21mm f3.4 and that looks good as does the VC 35mm f1.2 and 18mm f4 Zeiss-M. The Olympus lenses look promising, maybe perform better on the A7r than the Leica M lenses in general.
I hope there can be a greater percentage of postings with these and other wide/ultra wide angle lenses in order to clearly delineate where and with what lenses lie issues relative to their interaction with the sensor...esepcailly in real world shooting. Thanks!