DarkKnightNine said:No problem, The Leica S2 is a borderline Medium Format camera that has a huge 37MP sensor in lightweight camera no bigger than a Pro body DSLR. Not to mention that sensor is about 60% larger than a FF 35mm camera. It's great for fashion or studio photographers who need extreme detail in their shots and/or know their images will be blown up to billboard sized advertisements. You can read more about it here: http://s.leica-camera.com/
So basically it really is just the MP because you're blowing stuff up to such huge "print" dimensions? Makes sense.
Honestly I believe that Canon will also be releashing a high MP body as well, but wanted to kick off the new lines focusing on IQ. That's just my completely uninformed opinion, but for $50k I'd definitely hold out a little longer and see what they come up with. (Unless of course you're going to lose $50k of business in the next 3 months by not having the higher MP in which case it's a no brainer. )