I rented a Fuji X-T1 for a shoot this weekend (as well as to check it out on the football field). I'll probably write up an article comparing it to my GX7 at some point. I wanted to share this screenshot of a test frame I did to check both the DOF of the APS-C sensor in the X-T1 compared to the mu4/3 sensor but also to check the purported superiority of the X-Trans sensor in high ISO situations. It is true that--with zero noise reduction--the RAW files from the GX7 show noticeable noise at ISO 3200 whereas the X-T1 RAW files actually need very little noise reduction. They look really clean. However (and this is a big "however") when I applied noise reduction (Lightroom 5), the mu4/3 file was honestly not that much different than the X-Trans file. Here's the 1:1 comparison: Despite the differences in FOV between the effectively 50mm PanaLeica and the effectively 35mm Fuji (both set to f2.0), I don't see a tremendous difference between the two (other than a noticeable difference in color rendition). The GX7 files took noise reduction very well and I can go up to 70-80 on the slider, which takes out enough of the noise to make it comparable to the X-T1. I also don't see much difference in DOF between the 25mm Leica and the 23mm Fuji. Both cameras were placed on a tripod in exactly the same position relative to the Mamiya RB67 and I focused on the same point (the "M" in Mamiya). Granted the DOF will be different at subjects that are further away, but in my testing so far, I'm not seeing enough of a difference to be a huge factor. I've found the DOF argument so far to be a straw man. I'm evaluating whether it makes sense to use the X-T1 instead of the GX7 since they both are about the same size and weight and will be used for nearly the same function. I'm not convinced I can part with my 7D yet, so I added an L 200/2.8 prime. The autofocus in the 7D is a beast and the back-and-forth of the X-T1 is probably not going to be ideal when I get it into low light and with fast-moving action. The GX7 with PanaLeica actually does really well in the AF department. It's not as fast as the 7D but it's faster IMO than the X-T1. So far I like the X-T1's knobs and rings. Some people don't but I find them very convenient and they feel natural. But I also really like the GX7's touchscreen. As great as the knobs on the X-T1 are, the touchscreen is more useful since I can use it to set the autofocus point, manipulate menus, and scroll around a zoomed-in image in playback mode. That in itself is a huge time-saver. The viewfinder in the X-T1 is everything it's made out to be, however. It blows the pants off the GX7 viewfinder. It's faster to switch when you put your eye up to it and the X-T1's works better all around (I find it easy to fool the GX7's sensor if I put my finger near it but am instead using the touchscreen; that gets old pretty quick). I think it's actually going to come down to the usability of either with respect to physical controls and menus. The Panasonic has the edge in the menu department by several miles but the Fuji has the manual controls that feel good to use (except for the back arrow pad which really is a pain).