I've gone completely Leica M for my pro work but not Q
Sold all of my Canon gear 2 5DIIs, Metz 58, Canon 580, 24L, 35L, 85L and 200 2L and some other things. Had a Leica MM for about 3 1/2 years and a 35 1.4 Summilux FLE ASPH (which is the finest 35mm lens I have ever shot with by far and I've show with a lot of 35mm lenses over the years). My Canon gear about paid for a new M 262, used 90mm Summicron (mid 1980s) and very gently used M-E with one year Leica warranty and I already had Zeiss 35mm 2.8 ZM Biogon C. Also 2 used sf 58 portable strobe. NO REGRETS. I got what i paid for the 200 2L but most of the other Canon stuff I took a pretty good hit on. You wont take that hard of a hit on Leica equipment.
The size and wright difference are huge. The image quality is just amazing. The 90 2 for the mid 1980s out performs most every DSLR lens out there. I can only imagine what the new 90 Cron APO is like.
Here's a visual of the new line up.
L to R M 262 and 35 Lux FLE, M-E, 90 Cron and M Monochrom and Zeiss 35 Biogon C
MM and biogon C next to the 35L.
Biogon C and 35L
Lux FLE with hood and 35L without hood
MM and 35 Lux FLE next to 5DII 35L