So the....if I go with the R2, which lens? The 35/2.5 Color Skopar Pancake II, the 35/2.5 Color Skopar "C", the 35/1.7 Ultron (a push BTW), or the 50/2.5 Color Skopar or the 50/1.5 Nokton? I am used to working with fast 50mm lenses on my Nikons, but I hear that 35/2.X is "the RF 50/1.4"