I posted a similar photo comparing viewfinder sizes between the K7 + O-ME53 magnifyer and an old but lovely Spotmatic viewfinder for reference's sake here:
https://www.pentaxforums.com/forums/pentax-dslr-discussion/197510-spotmatic-f...k7-o-me53.html
Having recently picked up a GXR with it's electronic VF-2 viewfinder, I figured why not post the VF-2 view finder size in comparison to the above K7 and Spotmatic optical viewfinders. Again just for reference for those out there interested in such things.