So, I have been on the fence as to upgrade from the E-M5 to the E-M1. I finally decided to give it a try, with a few days off this week, and a lot of opportunities to shoot. I'm very aware of the nice upgrades of the E-M1 over the E-M5, but I have to say, I'm sort of underwhelmed. After shooting a few days with it (and my collection of lenses), I've got to say I don't see any "real world" improvements on focus speed/accuracy or image quality. To be sure, it has some nice feature advantages, but I'm just not sure I'm going to keep it over my E-M5. Here's a list of pros and cons, from my perspective: E-M1 Pros (compared to E-M5): -MUCH better EVF. it's not even close. This is perhaps the single strongest reason for me to replace my E-M5, as I shoot with the EVF about 80% of the time. -Larger image buffer. A lot larger. -Smaller single point focusing rectangle -The material on the outside is much "grippier" -The buttons are larger and there are more of them. Playback button isn't the smallest thing on the camera. -You can playback images in the viewfinder! Although I was only able to do this with the auto switch engaged- for some reason if you manually turn on the viewfinder, image playback is sent to the back screen -2 effective extra stops of bright light shooting (ISO 100 and 1/8000 shutter speed). -Button function selection switch is great. -The shutter sound is more muted. I love the way it sounds! E-M1 Cons: -More expensive. Especially if you're looking at either an E-M1 or E-M5, you can get insane prices on the E-M5 right now. -Image quality doesn't appear to be any different. Getting the image captured is more enjoyable, but the end product is the same. -Focus speed seems about the same to me. -I'm really not seeing any improvement with C-AF or Tracking, at least not with m43 lenses. -Front grip is much better, back thumb grip isn't. The E-M5 has a nice thumb rest built in on the back, but the E-M1 just has a little hump. -It's larger with no way to remove the grip to make it smaller. Now I realize that the pro list is much longer than the con list, but- for me I'm not sure if the pro list justifies the cost of the upgrade. I hesitated to post this, but figured since others might be on the fence about this, maybe my experiences might help out.