Here is how some Olympus pen F lenses behave on the A7R (all at infinity) and without a hood.
by Vivek Iyer
, on Flickr
Edit: When the front filter ring is removed, the 38/1.8 is devoid of the corner clipping (there is still light fall off at f/1.8 that evens up by f/5.6). Will check the others soon.