Re: Most used lens.
It just depends on what I'm shooting.
Macro, my 35mm. I love the ease of the 50mm but macro is about magnification and the 35mm wins. ( too many macro lenses to list the options)
Birding, the 50-200
Wide, the 7-14
Portrait, I use the Panny 1.4 a lot
Actually the EC 20 is the most used piece of glass I have. It goes under the 35mm and 50mm for macro and under the 50-200 for birding.