I know the question of m43 vs. other systems is one of the hottest topics around here, but I thought I would share about my recent exploration in to the Nikon ASPC world. I have been shooting m43 for about 2.5 years now and it is my first ILC system. After experiencing some (people walking down the isle) focusing issues with my EM10 at the first wedding I shot about a month ago (with primes), I decided to try out the Nikon D5500. I found a good price on a refurbished kit, and bought it along with the Sigma 17-50mm f2.8 zoom. For a few different reasons I am returning the Nikon kit and Sigma zoom. - I really missed the speedy, accurate live view functionality; evf; and tilting (instead of swivel) display. The Nikon live view focusing is very slow and the focus point is very large. While it may be generally better for low light or action, the D5500 focusing system is slower and feels more inflexible than the Olympus system. - Common Nikon primes are not image stabilized and would require higher shutter speeds. (not a problem with the Olympus because of in body stabilization). - The manual controls of the Olympus were much more to my liking – the two wheels in particular. It was nice to have access to two different settings without having to push an extra button. - My Olympus primes, 45 and 25, simply outperformed the Nikon kit and Sigma zooms in terms of sharpness. I know this is comparing apples and oranges since I didn’t try out a range of Nikon primes (I am sure they are great), but I was expecting the Nikon options to be sharper than they were– since they are both described as sharp. - I also realized that many of the Nikon lens options I was looking at had older technology than the Olympus system equivalents. (the 70-300 FF VR zoom for example) - I have two old Nikon lenses (50 1.4 and 85 1.8) that I adapted to my Olympus, and they automatically meter well on the EM10, but on the D5500 it is much more difficult to determine lighting accurately for these lenses since live view does not show what the exposure will look like. In terms of usability, these lenses are easier to use on my EM10 than they are on the Nikon system they were originally designed for. I know these lenses would work better on the D7xxx series, but that would require purchasing a more expensive and much larger camera. - I did enjoy the deep, secure grip of the Nikon, but that was pretty much the only thing I preferred over the Olympus. If I did stick with the Nikon system I would likely adapt over time. However, I have come to realize that Olympus has spoiled me with their feature set and lens quality. I still may pick up an ASPC or FF system at some point for professional use (because of the iso, dr, dof, and focusing advantages), but right now it just feels like I would be giving up too much in terms of control and convenience. Call me a lazy photographer, but I have really come to appreciate the convenience of the Olympus system, and I plan to stick with it and try to improve my technique for the second wedding I am shooting later this month. Thanks for reading. I would love to hear any thoughts or feedback you all might have, especially tips for using m43 at indoor events. I still have a lot to learn about photography, but at this point I believe the m43 system still fits my needs best.