Kravitz has some other Leicas besides the M8, and has for several years. I know this only because when I worked in a retail store here he came in several times with his leicas, despite us not stocking Leica stuff normally. To everyone I worked with it was a big deal, not so much to me because I was very 'familiar' with his neighbor for a while and one of my friends was part of his touring band (trombone).
but yeah, he shoots Leica and knows his lenses pretty well, and was very protective (and particular) about what went neat his Leicas, even though his income affords him the luxury of throwing it away once it gets a scratch should he choose to do so