I've known for the past year that I wanted to move to a full frame camera from my 7D so I've been slowly selling off my crop lenses and replacing them with standard lenses. So far in my kit, I have the 24-70mm 2.8 L and the 70-200mm F4 IS L...The only crop lens I still have is my trusty 17-55mm 2.8 and plan on selling that along with my 7D once my new 5D Mk3 arrives. I'm generally a landscape, street and occasional portrait shooter. When I look through my pics, most are taken at the wide end of my 17-55 and 24-70...most in the 17-35mm range. My 70-200 is rarely used but I keep it around for those times when I do need some extra reach...
One thing I want to do is add some primes for a lighter setup, say for street and night work. At first, my thinking was picking up the 16-35mm 2.8 and maybe the 50mm 1.2 or 1.4. But I'm wondering if I should just skip the 16-35mm altogether and maybe pick two primes instead. Maybe the new 24mm 2.8 IS when it becomes available along with either a 35mm, or 50mm or 85mm...Pretty sure I'm going with a 24mm to start...what I'm not sure of is either getting the 35 or 50mm but I'm leaning towards the 50mm...
Anyone have any thoughts or recommendations?
With the two FF lenses you own, the 5D MK II will go substantially wider than your 7D at 17mm, so you do not need wider until you see the results.
Remember, every lens on a FF body is going to be a lot shorter, so you will use that 70-200.
For portraits, 85mm to 135mm is a good range, The 135mmL is one I use the most.
I'd wait and see which focal lengths work for you before buying any more lenses. You may find you want to upgrade that f/4 zoom to f/2.8, or do like me and buy fast primes.
I have used the metadata search in lightroom to review my favorite focal lengths and apertures, and then prioritized buying primes using that. Now, I seldom use zooms except for walkaround outdoors, and my 100-400mm L at 400mm like it was a prime.