My 135mmL was by far my most used lens for a few years. Then, I got the 70-200mm f/2.8 MK II. Now, the 135mmL just sits. Then, I bought the 24-70mm f/2.8L MK II, and my 2nd most used lens, the 35mmL dropped off the list. So... I bought a 16-35mm f/2.8L. It gets no use, so go figure.
the 135mm and 1.4 tele might be a good option, but I don't know if $wise it makes any sense. I've used the 135 and I owned a 100f2. I never found the 100f2 lacking in anything compared to the 135mm(besides 35mm), it's awesome. what camera are you using? besides 135mm + 1.4 tele gives you a fixed f2.8 lens for nearly, if memory serves me and it usually doesn't, the same money as a 70-200 2.8. unless you really need that 135 f2, I would take the 70-200 over it all day. I did in fact.
I'm firmly with these guys. Get the 70-200 f/2.8is. It's truly one of the all-time great lenses. Too conspicuous? That may be true shooting in the favellas in Brazil but at a sports event? Hardly. You'll blend in.
I also found my (now sold) 135 f/2 was sitting unused and the 70-200 was getting all the work. I very rarely used the 135 below f/2.8 (too hard to nail focus) and I missed the IS and the total flexibility of the 70-200. Look at the photographers on the sidelines of major sports events. Most will have two bodies. The majority will have a 70-200 on one of them.