When I was a working photojournalist I shoot with RF (Lieca IIIG and Canon 7) and SLR (Nikon F, F2, F3), I now shoot with a Mamyia Universal, I have rented a Hassy or other MF SLR, and I would match a RF to any SLR in terms of negative quality. In terms of versatility and convenance the SLR wins hands down, but for a quality negative my vote still goes to the RF.

Regards