I know this is probably the most talked about discussion here, but I am twisted up about it. I recently moved from the 7D to the 5DmkIII. I have sold my 10-22mm and replaced it with the 17-40. Now, I am having issues with what will replace my old Sigma 17-50 f2.8 OS. I have all my ranges covered for now, so I am not in a big hurry, but my Sig was one of my most used lens because I do a lot with strobes. I didn't need prime speed and I liked the range in these situations. Outside of that, I like a standard zoom as a walk around in non-low-light.
So, I am itching to get a standard zoom, but I am torn:
Canon 24-105 f4 IS - At 750 street price around here (white boxes), this would be perfect for my stobist needs and good for video. With the 5D3's high ISO capabilities, it can suit me for most occasions. I am just wondering if I will regret not getting a 2.8 lens now that I am FF. I would like to feel like I am taking a step forward and not laterally.
Canon 24-70 f2.8 II - I do not make my money off of photography, but I am in a potion that I can afford this lens if I really want it. I would love the sharpness of this lens. My big issue with this lens is the lack of IS for this price. When I am shooting my kids, I like to get video every so often. The IS would be awesome for that.
Tamron 24-70 f2.8 VC - This one seems like a perfect fit for me. It is sharp enough for my needs and has VC. I would get this lens in a heartbeat, but it is still selling for MSRP. Because I am not a pro, I always justify lens purchases because of their resale value. If I buy a new lens, it is because I know I will own that lens for a LONG time, or if the resale value will hold.
Am I crazy about the MSPR thing on the Tamron? Will this lens become cheaper anytime in the near future? I am willing to wait a few months, but I would love to hear your thoughts on which one you would go with in my situation.