Seems like not really. Check out this reference:

http://www.nemeng.com/leica/002c.shtml

The R6 or 6.2 is basically a mechanical Minolta and very, very expensive on the used market for what you get.

I'd seriously consider a Leica R8 which is a bargain on the used market and and the finest 35mm SLR I've ever used. I think the perceived reliability advantage of the R6 is mostly illusory. If you decide to purchase an R8, make sure you purchase one with a serial number above 242700 as the earlier ones had some teething problems.