A very nice article has been published by Focus Numerique. The google english translation is available here. They try some unusual combinations like the Olympus Pen E-P2 and a Jupiter 85mm f/2 or the E-P2 and 60 years old Elmar 35mm f/3.5
.
A very similar article has beenw ritten bei enfoquemanual.com (written in spanish and english!)