IF the Canon EOS M3 indeed comes with
* 24 MP APS-C Sony sensor ... as in A6000 (or even upcoming A7000)
* plus further improved AF system (Mk. III) from Sony A6000 (or A7000)
* plus EVF (as in Sony A6000 or upcoming A7000)
* at a price not higher than Sony A6000 (or A7000) and available as "body only, w/o kit lens"
I will pre-order on Day 1.
I was thinking along the same lines, but I couldn't resist the lure of mirrorless Frull Frame..
I had previously used the Sony A7r with Zeiss FE55 but returned them due to the high price for mere "portable" or "backup" duty.
But the recent eBay deal on Zeiss FE55 for $799 forced me to rebuy that beauty (where is the new 50 mm, Canon?), and I will pick up a discounted and/or used Sony A7r after the A7r Mk II is launched. If the A7r Mk II sports 50 MP as rumored and becomes larger with IBIS as A7 II has, then I'd rather have the svelt, 36 MP A7r anyway..