I have the 70-200 f/2.8L IS II and the 85 f/1.2L II. For headshots, both are great lenses. But for you, I'm not so sure either is your best bet. Let me walk you through my thinking. Granted ... I don't know what you shoot when you say "portraits" it covers a lot of ground. But hey, I'll dump out my thoughts nonetheless.
First, the 70-200 f/2.8L IS II. If you only take headshots, go for it. But if you take much that's wider, on a body with a crop factor especially, consider your working space. At a distance of 18 feet, you'd barely frame a 5'8" subject at 70mm.
Secondly, the 85 f/1.8 (my opinion is based on the 1.2L II). This is a second portrait lens, not a main lens. It's too limiting to be a main lens. You may work differently than me, but I like the option of free-flow shooting. For shots I set up (say an executive portrait), I can use the 85. I know I want a 3/4 shot, or a headshot, or whatever and I can plan and work around that distance then move for another series of shots. But mixing full length, 3/4, headshots for more action-oriented shooting (say band portraits), it's a terrible lens. You need a zoom as you'll find the need to change focal lengths constantly.
On to my suggestion:
If you shoot mainly outdoors, go for the 70-200. Otherwise, I'd strongly suggest the 24-70 f/2.8L II. It's going to give you more flexibility to frame shots on the 650D. Consider the 85 f/1.8 as a second lens for those times you want what it offers.
Your list includes mainly sub-$500 lenses, so I will also suggest the 24-105 f/4L. I don't think anyone has suggested it yet, but I've used it myself quite often for portraits. I'll post a couple. It is not as sharp as the 24-70, but it is $700 cheaper -- and an excellent portrait lens with a very good zoom range for portraits on an APS-C sensor (effective 39-170). You can buy this AND the 85 for less than the 70-200...
That said, you don't have any bad portrait lenses in your list. Just carefully consider your shooting style and the best fit should be obvious.
Here are 2 samples from the 20-105:
First, the 70-200 f/2.8L IS II. If you only take headshots, go for it. But if you take much that's wider, on a body with a crop factor especially, consider your working space. At a distance of 18 feet, you'd barely frame a 5'8" subject at 70mm.
Secondly, the 85 f/1.8 (my opinion is based on the 1.2L II). This is a second portrait lens, not a main lens. It's too limiting to be a main lens. You may work differently than me, but I like the option of free-flow shooting. For shots I set up (say an executive portrait), I can use the 85. I know I want a 3/4 shot, or a headshot, or whatever and I can plan and work around that distance then move for another series of shots. But mixing full length, 3/4, headshots for more action-oriented shooting (say band portraits), it's a terrible lens. You need a zoom as you'll find the need to change focal lengths constantly.
On to my suggestion:
If you shoot mainly outdoors, go for the 70-200. Otherwise, I'd strongly suggest the 24-70 f/2.8L II. It's going to give you more flexibility to frame shots on the 650D. Consider the 85 f/1.8 as a second lens for those times you want what it offers.
Your list includes mainly sub-$500 lenses, so I will also suggest the 24-105 f/4L. I don't think anyone has suggested it yet, but I've used it myself quite often for portraits. I'll post a couple. It is not as sharp as the 24-70, but it is $700 cheaper -- and an excellent portrait lens with a very good zoom range for portraits on an APS-C sensor (effective 39-170). You can buy this AND the 85 for less than the 70-200...
That said, you don't have any bad portrait lenses in your list. Just carefully consider your shooting style and the best fit should be obvious.
Here are 2 samples from the 20-105:
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