He was more specific to the 100mm f2 USM not f2.8 Macro.
Never used the 100mm f2 but I can tell yah that the 85mm f1.8 is wonderful lens. Lots of bang for the buck and a good build quality. Sharp!
I shoot mainly with: 24mm f1.4L, 50mm f1.4, 85mm f1.8, and 135mm f2L . Never needed anything else.