I enjoy shooting landscapes, wildlife and other subjects that frequently require a zoom. I already have a Canon EF 70-200mm L but it just isn't quite long enough.
I'm currently considering the Canon EF 100-400L, the Sigma 150-500 or the new Tamron 150-600mm to pair with my Canon 5DM2. I'm especially keen to get the lens by Thanksgiving because I'll be travelling for both Thanksgiving and Christmas. I've already ordered the Tamron but it's on what is likely to be an extended back order.
If you wanted a versatile zoom lens to go with a Canon 5DM2 what would you choose (and why)? Will