I don't owe the CZ 135 lens, but I think that's my most wanted a-mount lens, the second would be 70-200 F2.8 or 135 F2.8 stf but they are 2 expensive.
for the lenses i used, I love the Minolta 24 F2.8, 50 F1.4 RS and 135 F2.8, they are all very sharp and light weight, good for travelling.