I want a 100-400 II. Basically, I only have the money for one expensive lens this year but I recently went with the 24-70 f/2.8 II. Awesome lens, fills a rather important range in my lineup, but I am regretting not getting the 100-400 instead because I think I'd enjoy it more. So I currently have 3 lenses that hit the 24mm focal length, and I think one of them will be sold to help fund the 100-400:
- When I need wide, I grab my 16-35 f/4 IS. The big aperture of the 24L is useful occasionally, but the zoom has been used a TON more for wideness. Will not sell the 16-35.
- The 24-70 f/2.8 II delivers equal image quality along with zoom convenience. f/2.8 is obviously slower, but wide angle stuff for me is landscapes/cityscapes that aren't requiring the f/1.4. The 24-70 fills the role of walk around lens that is occasionally used for model/product shoot, so it's somewhat of a work horse lens (especially if I ever 2nd shoot weddings again).
- 24L II is one of the lenses in my collection that I have had the longest, so it has some sentimental value. Used for indoor, low light group shots in addition to occasional astro pics. The issue with selling is that the proceeds from an used, refurb 24L II will still leave me a good amount short unless I get super lucky and land a refurb 100-400.
Here's the kicker: I am still within my return window for the 24-70 f/2.8, which would completely fund the 100-400. I've been living without a 24-70 for 8 years up until recently (with help of 16-35, 24L, 50L, and 70mm of my 70-200), but the versatility of the standard zoom is really nice for walk around and quick situations.
I hate photography gear choices 
Sell 24-70 f/4 IS


