I love the IQ of the 50APO and M240. I don't think you should sell your 6D and 50L for the combo though.. Two reasons, first rangefinders aren't for everyone. Second, I don't think you'll appreciate the increase in quality vs the cost of the system. I'm not saying you can't see the difference, but it really takes a keen eye and a obsessive person to want to pay for that difference. Not to mention the learning curve of a range finder setup.
I think most people see a bigger jump in quality (not really quality, but mood/style) going to something like a M240 + 50 Summilux-asph from a Canon setup.
I'd honestly sooner recommend you spend your money on the 50 MPZE lens from Zeiss for your 6D. It'll give you a bit more WOW factor, and it's a cheaper lens then the 50L.. That and you can add the stellar 21ZE and 100 MPZE and spend the rest of your money on a trip somewhere that has better light for photography then Singapore.
IF you want the rangefinder experience.. Then I'd suggest you get the 50 Summilux-asph as mentioned above, because it gives you more wow factor out of the starting gate.. And it's also a tricky lens to learn over the long run, so it'll test your rangefinder patience.
I also own everything, canon/leica, so I am not being bias in anyway. I use both systems for work.. More so the Leica these days, but some clients, I just can't be bothered to use a rangefinder for.
I can also sell you whatever you want, I have it all, if you wanted to buy, just PM me