I've looked at them 4 times now, the 4th time was this morning. I have the MK I. The images are said to be slightly noiser on the MK II, due to the smaller area of the sensor in use. (Its the same sensor). I like the touch screen, the improved lens, the flip up screen is a wash compared to the swivel screen on the MK I. It dies have WiFi, but its said to be klutzy. $800 for a camera with no viewfinder seems silly, and I would not add $300 more to get the viewfinder. I can get a 70D for less.
Looking at the price, I decided that upgrading wasn't worth the $$$, so I'm waiting for the price drop this fall..
Well, I finally decided to sell my MK I and get the MK II.
There were a lot of things that were improvements.
1. The wider, faster, and longer lens
2. The much faster autofocus, its heads and shoulders faster.
3. I can finally focus closely, almost macro.
4. The 3:2 LCD rather that the 4:3 one.
5. The lens finally has a shutter.
6. Just as in the MK I, the large sensor was the deciding factor over the 1" sensor bodies with better WI-FI.
7. The touch screen is also a bit strange, it seems to hang up occasionally, or at least it does not respond reliably to my touch. I have a touch screen stylus for my tablet, and it works great.
Not so good things: (I admit I'm spoiled by my 5D MK III and all the 1 series bodies I've owned) Its interesting to note that the Wi-Fi issue was also noted in the DPR review, its worse than they noted, IMHO.
1. I'd list Wi-Fi as a pro, but it is truly klutzy, it works, sort of, but what were they thinking?
2. I also found my first try at autofocusing in dim shadows indoors was difficult. The AF assist light did come on, and that worked, but for some reason, it did not come on at first.
3. 12MP is enough, as long as you do not crop a lot. I'd like 16MP.
I'll likely post some photos later, I spent half the day fooling with Wi-Fi and learning how it works. I never could hook it up to my wife's Flickr Account, and it disconnects after 10 sec when linking to my computer. It uploads to Facebook and the Canon Image site just fine. Then, the images download back to my computer from the Canon site. I think someone who figured that out was hitting the Sake too hard.