Canon 24-70 f/4 L IS

DXOMark has them listed. For example, the two lenses compared in this thread:

http://www.dxomark.com/Lenses/Canon/...urements__1009
http://www.dxomark.com/Lenses/Canon/...urements__1009

Click "transmission" when the links open for each.

Dave

Thanks Dave. It looks like most of my lens are 0.3 to 0.4 stops from their f, with the 24-70mm f/4L IS one of the rare exceptions.

Thanks, Dave.

Good to know.

Danny

My wife was looking a full frame standard zoom lens and we decided to get another 24-105L. I'm going to keep mine. Thanks everyone!

The primary reason why is the range. Having 71-105mm is a great edge. I also think I was probably being a bit unfair to the 24-105L. Most of my best shots in the last year came from it.

Dave

Congrats. She should know what to expect. It really is a very good lens and, perhaps, one of the more underappreciated lens.

Dave,

Not sure if this weighs in on your purchasing choice or not, but I had the 24-70mm f/2.8 v1. I never really enjoyed the 24-70. I sold it and purchased the 24-105 and couldn't be happier. Not sure if the t-stop difference is anything, but I for one prefer the extra zoom of the lens. I have lots of primes and zooms and this is on my camera more than any other lens. I know you think it would be an upgrade, but look back on your shots with this lens and see what is the majority of mm you have used it with. If it is above the 70mm range, I wouldn't change. I always found the 70mm limiting, especially on a full frame.

Congratulations! I often use the 24-105. For the 35-105 mm range I never find that the lens IQ is the limiting factor. When I can stop down to f8 even the 24-35 mm range seems fine.