I really like the 40mm focal length (35mm equivalent) - I can happily walk around all day with just my E-PL3 with the Panasonic 20mm lens attached. To get this focal length on the Nex I would need a 28mm lens. Not wanting to spend too much, so am looking at legacy lenses - any recommendations? My main criteria is a short minimum focal distance and reasonably fast (2.8 would be realistic I guess to keep it low budget) - but it needs to be reasonably sharp at f2.8 as I like to shoot wide open sometimes. Or would I be better off just getting the e-mount Sigma 30mm?