My favourites: the 50/1.2L and the 135/2. The latter, I bought from Kermaier, by the way. I have used also for a long time 50/1.8, 20/2.8, 100/2.8 and 135/2.8. All second hand bargains. Actually using the FD-system only occasionally with an F-1n and still having a nice boxed A-1 for sale.