but the EF 100 f2.0 is not an L lens... but it is still noticeable faster?
It's all relative. Compared to the 85L II, the 100L is a speed demon. But it's a lot slower than most other L-series lenses.
I don't like the slowpoke AF of the macro, compared to the 100f2. The 100f2 focusses instantly!i read the EF 100mm F2.8 IS L macro is pretty fast focusing?
Yes, it is. The 85/1.8 is also faster, and much
faster than the 85L. For L-series lenses, I think the three slowest ones are the 180L Macro, the 85L, and the 100L Macro. The 100L Macro also seems to hunt for focus more frequently than many other lenses, especially in dim light.
It's also worth noting that despite being an f/2.8 lens, the 100L is in 'Group C' meaning on the 1D X/5DIII it doesn't activate any of the high-precision f/2.8 cross points. But not to be outdone, the 180L Macro is in Group G, so while it's an f/3.5 lens not only does it not use the f/4 crosses, it can only use 33 of the 1D X/5DIII's 61 AF points.
Bottom line, don't look to a macro lens for excellent AF. Which is ok for me, because I'm almost always manually focusing for macro shooting, anyway.