I recently took my HV20 and the GT35pro 35mm lens adapter out to a RED camera test that we were shooting. I wandered around with it grabbing shots here and there, some of the RED camera, some of the scenes it was shooting. I intercut the RED footage and the GT35pro footage in this piece and tried to match the colors and tone. The RED footage obviously has the letterboxing but overall I think both cameras look pretty good.
Read the full post on this test at my post on Pro Video Coalition: tinyurl.com/GT35meetsRED.