Just to add about my own experience with this combo: I have strong myopia so when I take out my glasses, I can focus using the GXR's LCD screen comfortably at natural distance (like ~10cm from my eyes). The great thing about this GXR is that: I can see if subject is in focus or not very clearly without having to use the various focus assist features (like peaking, centre-zoom, etc. all very slow and inconvenient to me.) And WISIWIG! This is NOT the case when I did the same thing with E-P2 and NEX-5. It's like the GXR's LCD is factory-calibrated to my myopic eyes

Seriously, I get a lot more in-focus shots (esp. off-centre ones) with the GXR than my M9. How I wish it is FF or at least 1.3X then I would sell my M9-P HAHA...
For those who need to move the LCD much further from you eyes, whatever I experience may not be applicable at all. So caveat: YMMV.