Yep, I have a full Canon DSLR kit which I use for night events, anything telephoto, studio shots (though I want to start using my M8 for that) and long-exposure stuffs (due to Live View).
Shooting day events, I'll walk around with a wide on my M8 (the ZM 25mm usually) and a tele on my DSLR (135L mostly).
Both are great, but very different handling & very different strengths & weaknesses. I use the Leica more for my personal work (and favour my M4-P over my M8 for that).