Don't trade it for 35mm, you'll regret it. Leicas are awesome and the lenses incredible, but they're still limited by that tiny film. I used a Hasselblad for years, but my health issues were making it harder and harder for me to handle the weight of the camera and the lenses I had for it. I traded it for a Mamiya 6 rangefinder. That camera and the three lenses for it are small and lightweight; I can carry them all day without pain or fatigue. The image quality is fully up to Hasselblad levels.
When it comes to wanting to trade my Hasselblad for a Leica M6 body, the deal is, I also have Fuji 6x9 90mm, and I prefer that format to 6x6 anyways.
I have an M4-P already and want a second body.