I'm not really trying to stir the pot here, but I've come to wonder how much of people's impressions of larger sensor formats have to do with the difference in aspect ratio compared to 4/3 and most other smaller digital formats. I recognize the improved quality that Full Frame can offer in some circumstances, but I find it fascinating that APS-C still enjoys the cachet of being considered a significantly larger format. While nominally 60% larger than M4/3, it becomes only 40% larger in area if you prefer the more square 4:3 aspect ratio. Even 40% sounds like a big number, until you see it compared in an actual image: So if you like 4:3, APS-C is essentially a negligible bump in size (40% larger is exactly 1/2 stop assuming sensor technology is at parity). I'm not sure how excited people would be to go from an f2.8 lens to an f2.4 lens, or an f2 lens to f1.7. Probably not very. It was recently printing time again. My girlfriend and I printed about 120 photos (4x6s and 8x10s) coming from a variety of sources that are either 3:2 or 4:3. Getting everything cropped properly while maintaining what made the shots good in the first place was really challenging! Generally, however, I found it a lot easier to turn 3:2 images into decent 8x10s (5:4) than to turn 4:3 images into 4x6s (3:2), particularly anything that isn't just a landscape with a lot of white space. I found that I was filling the space in a 4:3 image better than in 3:2. It's made me realize that I really generally do think in 4:3, and I enjoy the additional real estate that it offers. If anything, I find I'm more likely to crop my images more square to 5:4 or 1:1 than I am wider 3:2 or 16:9. While I learned on 35mm film SLRs, I didn't start to get more serious about photography until I used digital, and that was mostly with 4:3 point-and-shoots and more recently my Micro Four Thirds system with the same aspect ratio... So what's your favourite aspect ratio? Is it the same as the native format of the camera you use most often? And do you think that camera has itself shaped that preference and the way you compose? Also, by way of compensation for once again daring to mention sensor size, I offer penance in the form of a 4:3 portrait landscape image that I enjoyed making. I think I want to print this one at 16"x24". Maybe a bit bigger.