I recently gone through all the pictures I took over the past 4 months to find out that I did not use my 28-70mm 2.8 L for any of serious photo shoot at all. That has been in my cupboard and getting dust on it. That made me thinking if I actually use that at all. I decided to sell it to invest in a lens that I needed - 135mm F/2 L. I bought it second hand for a good price about 2 weeks ago, but never had a chance to go and try it until yesterday.