In context, of course =P I just got my E-M5 a couple of weeks ago, and it has made me realize that the new IBIS really is incredible. I find the "up to 5 stops" claim to be completely accurate, since I consistently get about 4 stops better than what I could muster on my G3, in many cases 5. I consider myself to have good technique already, so IBIS coupled with proper shooting form makes for a formidabble combination. Yes, people will shout "IBIS doesn't help for sports or moving subjects", but honestly, so? Obviously it doesn't help in all contexts, but judging by the types of images on this website and others, few people are shooting sports at night if they aren't professionals anyway. Quite frankly, I'm shocked at how consistently I'm able to take tack sharp photos at 1/8th of a second. When I bought my E-M5, I fully expected to start pushing ISOs higher than I ever did with my G3(where 3200 was my max) thanks to the sensor's improved performance. But instead, I've found the opposite! I have auto iso limit set to 1600 because rarely do I need to set the ISO higher than that ever when in bars and such. On the rare occasion I do, I'll just set the iso manually. For static objects, then subject movement doesn't matter, and for most night-time portraits, I can get people to stand still for the short amount of time. It also makes the E-M5 a formidabble video machine for the common user. Video frame rates, bitrates and whatnot are obviously important, but no such settings can save a wobbly video. On a lot of handheld GH3 videos, I've rolling shutter rear it's ugly head, or just plain wobbly looking video. The E-M5 has no such issue. As a casual user who's worked with video semi-professionally before, I think I'd the E-M5's IBIS over most of the GH3s feautures(and no, OIS doesn't look nearly as good for video). It almost looks as good as a steadycam rig. This video demonstrates how good it is best: [ame=http://vimeo.com/46037469]Journey (Olympus OM-D E-M5) on Vimeo[/ame] So as I considered to splurge on the great D600 deal, I realized for most of my subjects I would see no improvement in low light performance by moving to a full frame system. I typically shoot with primes at 90mm or less. Most prime lenses in this range for full frame cameras aren't stabilized at all anyway, and any that are aren't stabilized as effectively as the with the OM-D IBIS. To put it more simply, if I'm out shooting with an 85mm f1.8 lens on full frame and the 45mm f1.8(90mm equivalent) on my OM-D, I'm going to get better low light results from the Oly most of the time unless I have a tripod with me. Of course, if you want low light performance that works well in ANY situation, full frame is still the way to go. But I believe for 75% of shooters, there wouldn't be a substantial difference.