An Olympus E-PM1 kit and Nikon D5100 outfit user, I'm awaiting my tax refund at which time I intend to upgrade my E-PM1 to the E-PM2 for the newer sensor technology. A few questions: (1) The Fn button nearby the shutter release, I've read conflicting reports--is ISO one of the options it can be remapped to? (2) I have Lightroom 3.5--I assume no way, no how, it will work with the RAW-ORF files? I will need to update it to LR4? (3) So far, are any users observing IBIS problems as was with the E-PM1? (In my case, IBIS seems fine, especially if I engage "anti-shock" even 1/2 second or so.) (4) I assume that, as with the E-PM1, shooting in 4:3 ratios means the LCD has the "black box" effect due to the mismatch of aspect ratios LCD vs image? Is the E-PL5 the same way? (5) Store with the best price? I also am looking towards getting the Sigma 19mm and 30mm lenses, if I can still find any, the Olympus 45mm 1.8 lens also tempts me for portraits, but I figure the wife won't be open towards me upgrading to the E-PM2, getting the Sigma lenses, AND getting the Olympus 45mm.