real life rf combo would be my bessa r2a + zeiss biogon 35 f/2.0. i currently have the m-rokkor 40 f/2, and as great as that lens is, 40mm is just slightly too narrow...
edit: i jsut rechecked my pics with rokkor and there's nothing too narrow about that lens, it was just my gas speaking.
so, after a second thought, i could happily live with r2a + m-rokkor 40mm f/2