135L is definitely on my shopping list
Took a powershot with equiv of 35-105 on vacation last year, and it wasn't enough on either end.
Am playing around with a 70-200 2.8 IS II of my buddy's right now, and while it is a great lens, it is a beast, and I just can't imagine lugging it and a wide angle up and down canyons/mountains in 100 degree heat.
Agreed, the 1,490 gram (3.28 lb) 70-200 f/2.8isII it is big & heavy. And fabulous. It's my most used lens.
But for travel? This is where the extraordinary 760 gram (1.68 lb) 70-200 f/4is gets a big mention. It's one of the all-time-great travel lenses with two notable advantages over the almost identical weight 750 gram (1.65 lb) 135 f/2. For a start, the obvious flexibility of a zoom plus the incredible IS performance of this lens. Don't underestimate IS power in helping deliver keepers. I had a stellar 135f/2 and sold it within a year. Maybe I've got slightly shaky hands, but my keeper rate with the non-IS 135 f/2 was disturbingly low compared to my 70-200 f/2.8isII.
A revised 135 f/2 with IS will sell it's socks off. It'll come eventually.