As I have worked with many of the SLR's and Medium Format camera's out there, I want to share with you some of my favorites. In my career I used Nikon, Canon, Pentax SLR's and all of the Medium Format stuff out there.
My choices are based on my most frequent go for lenses when doing actual projects in the past and present.
Pentax: smc Pentax DA 40mm f/2.8 Limited
Pentax: smc Pentax FA 31mm f/1.8 Limited
Pentax: smc Pentax DA Star 16-50mm f/2.8 ED AL (IF) SDM
Pentax: smc Pentax FA 50mm f/1.4
Pentax: smc Pentax DA 12-24 f/4.0 ED AL (IF)
Canon: EF 17-40mm f/4.0 L USM
Canon: EF 35mm f/2.0
Canon: EF 28mm f/2.8
Canon: TS-E 45mm f/2.8
Canon: TS-E 90mm f/2.8
Contax Carl Zeiss Distagon T* 28/2.8 MM
SMC Pentax-A 50/1.4
Contax Carl Zeiss Planar T* 85/1.4 MM
Mamiya M645 A 120/4 Macro
Canon EF 135/2L
Mamiya M645 A 200/2.8 APO
Canon EF 24-70/2.8 L USM
Canon EF 70-200/2.8 L IS USM
MF Fujinon EBC 90/3.5 (mounted on a Fujifilm GW670II)
LF Fujinon-W 150mm f/5.6 EBC (in Copal 0)
I still use all of the listed small format lenses with EOS DSLR bodies.
These ones might eventually get on my list:
Voigtlander Ultron 40/2 Asp SL II
Leica Summicron-R 50/2
Voigtlander Color-Heliar 75/2.5 SL