I'd really like to read your thoughts about the ef 300mm 2.8 lenses--and see some samples. Thanks!
I hope you've taken a look at the Canon EF 300mm f/2.8L IS II USM samples thread which shows that the 300mm can be quite versatile.
Of course, there is an element of "if all you have is a hammer, everything looks like a nail" with those kinds of threads
I went for the 300mm because I found that the 70-200mm was a wee bit short from time to time, and the 400mm f/2.8L was just ... too big and heavy, and too long for me on a crop camera (I since moved to FF). Full disclosure: I did have the 400mm f/2.8L MkI
I think the biggest lure is the sheer versatility of the 300mm: stunning bokeh, not too long, and if it's a bit too short, just slab on a MkII/III extender. And you can handhold this thing.
So while it is a "sports and fashion shows" lens, it can also be used on large and not too skittich wildlife.
For portraits, the 200mm f/2L is likely to be more useful, but for me, gaining a single stop is not worth it.