My 24-105L ver 1 was an excellent copy and was plenty sharp for me at f/4.0 but, it was 9-10 years old so having a new improved ver II lens, with new warranty was my major motivation for upgrading. The 4 stop IS and 10 blade rounded aperture, along with improvements to the optics are all just bonuses. I shoot primes mostly so I do not need prime quality sharpness in my zooms. I will be plenty happy if the new ver II is as sharp as my ver 1. I have already sold my ver 1 so I am kind of committed to the ver II now that there is a void in my 3 compadre's f/4.0 IS zooms.




