I will be very classical...
My best FSU camera is a wartime Fed NKVD S (with the 1/1000th). But with a 2/5cm Sonnar.
And don't tell me I am not playing fair: my Sonnar belongs to a series made at Jena by the Germans for the Soviets. So, it is "M" marked, like all the other lenses in the same case.
As for the body, I love the sound of the shutters at 1/20th of a second... And the viewfinder/rangefinder, very precise when accustomed.
Amitiés. Jacques.