I am awaiting the arrival of the following beauty - an Olympus OM 35-70mm f3.6. This little lens is regarded as one of their sharpest and best short zooms from that era. It has a constant maximum aperture. When I say "little" well it is an OM lens but for one of those lenses is not quite so little, weighing in at over 400 grams being packed solid with glassy goodness. But even so I felt that it would make a nice walk about lens on a Sony NEX 7.
I am beginning to feel the desire to try some more OM lenses on mirrorless cameras due to their relative small size and sound performance though I have to say I am not all that taken by their physical appearance which looks OK - but merely average. (Some lenses are pretty and some merely functional). While on the topic of new(ish) purchases I have also recently bought the 100mm f2.8 OM lens and found it is a nice performer which is particularly nice because it is tiny - being about the same size as most SLR 50mm lenses..... depicted below in a Sony A7 (not mine).