Hi, I'm considering buying the Canon 135 f2 L series lens as a portrait lens. It will usually be on a 5D Mk II and perhaps occasionally on a crop frame such as a 7D or 40D. Lighting conditions will vary from studio to fill flash to existing (often existing church indoor). I'm currently shooting mainly with a Canon 70-200 2.8 L and a Canon 24-105 4.0 L but the sharpness of the 135 prime pictures I've seen really has me wanting it. I know that 85mm FF is considered the "correct" focal length for portraiture. But the last prime I owned (decades ago, before I got away from photography for a while) was a 135, and I left it on my camera most of the time--it was my favorite go-to lens. I know there's no "right" answer here; I'm just looking for input from people who use 135 for portraits or from anyone who has a good basis for 85/135 prime comparison. TIA.