I used the 24-105L for years, but after owning the 24-70VC for a few months I sold the 24-105L. The Tamron is the better lens in almost every way. The Tamron stays on my 6D a good percentage of the time. For landscape, it has less distortion, is slightly wider (although listed the same), far less vignetting, better color rendering, and then it has a lot of advantages for wide aperture shots. I find the bokeh rendering great on the Tamron:
Resurrection by Thousand Word Images by Dustin Abbott, on Flickr
Stopped down it is a great landscape lens. Nicely sharp!
As the Ice Forms by Thousand Word Images by Dustin Abbott, on Flickr
Dustin, thanks for posting these images and your opinion on the Tamron 24-70mm f/2.8 VC. I've been contemplating this lens since I picked up my 5D3 a few months back. I've been going back and forth between this and of course the EF 24-70 f/2.8 L.
Your images here take a little of my concern away. Can you tell me about the fit and finish on the lens and how it feels on your camera? Is the zoom ring smooth like an L lens? Stuff like that I'd be interested in knowing...
I'm not sure which lens we are using as a comparison point, but having used quite a few lenses, I can throw out some general comments.
Fit and finish is actually very good. The lens feels very dense in your hands and in no way cheap feeling. I have been using mine for 8 months for many purposes (including travel) in bags, holsters, and Cotton Carrier type harnesses, and I have had no issues with anything, including any kind of cosmetic marking. One positive note - unlike many older L lens' hoods, this hood does not mark easily AT ALL. The smooth finish on older hoods was notorious for easily marking. I have used the lens in a lot of adverse weather (rain, sleet, snow)without any ill effects. The lens has a zoom lock, but I have never had to use it because it exhibits no evidence of creep at all to this point. The rubberized surfaces on the zoom and focus rings has held up perfectly. I would say that my copy looks like new still without exaggeration.
The zoom ring is smooth but stiffer than some of the better zoom rings I have used on top Canon lenses. It doesn't hang at all, but has more resistance than some other lenses. The smoothest zoom lenses are the internally zooming ones, of course, but there is a bit more resistance than my 70-300L for example and slightly more than what I remember from the 24-105L also. I don't notice it in the field, but when directly comparing it I do. This may contribute to the complete lack of zoom creep. This would probably most be a factor if you were wanting to smoothly zoom during video operation. It can be done, but takes a bit of practice/adjustment to the resistance.
The VC is huge. Period. It is so beneficial. If you do shoot video at all, it amazing how rock steady you can shoot. I have actually handheld this .8 second shot:
Metro Arrival by Thousand Word Images by Dustin Abbott, on Flickr
I have a pretty decent kit (see my signature), but this lens is my most used tool. It is just very flexible and produces consistently great images.
Thanks Dustin, that's exactly what I was looking for. You've made up my mind! I was going back and forth over this and the 24-70mm f/2.8L.
I just sold my 24-105L and I liked it a lot but I never really loved it. I love all my other lenses. I wanted the 24-70mm 4/2.8L but never pulled the trigger, as I really like having IS. Especially with low light situations even with the 5d3 and it's capabilities. I'm 53 now and I do often see some oof from shaking a little bit on a few non IS lenses I've used or borrowed from friends, even on my 85mm... So I've wanted the IS.
I'm glad Tamron came out with it, do to the price point, just had some trepidation where all I've owned mostly has been L glass, I just didn't know what to expect but wanted it to be a fantastic lens that I would not regret purchasing over the 24-70mm f/2.8L.
I think you answered my questions, thanks again for your time!
All the best,