I'm not one for carrying toasters and telescopes around which is what drew me to M43 in the first place, it's small size. When considering the X-Pro1 I had to determine how much of a size/weight penalty I was willing to take over my GH2. Turns out, there really isn't any. Size/weight in mm/grams GH2 124w x 90h x 76d 444g with card and battery OM-D E-M5 122w x 87h x 45d 425g with card and battery X-Pro1 140w x 82h x 46d 450g with card and battery The GH2 is much thicker thanks to it's manly grip. The X-Pro1 is slightly wider, they are all close in height and weight. Ah, but what about the lens? Leica 25mm(50mm) 63w x 55d 200g Fuji 35mm(53mm) 65w x 55d 187g Again, pretty darn close. It's not until you move past 50mm equivalent that you take a size / weight hit with the X-Pro1 thanks to the M43 crop factor. hth .