I've got a few iterations:
RF: my Leica M4 with DR Summicron.
SLR: my black nikon F2AS with 50mm f/1.2 Ai.
For nostalgia: Pentax Spotmatic with Super-Multi-Coated Takumar 50mm f/1.4.
That which I lust: Voigtlander Prominent II with 50mm Nokton.
Close second in the RF category: Nikon SP with 5cm f/1.4.