I recently just picked up the Sigma 18-35 1.8 with Canon speed booster to replace my PL 15 and PL25. I am really in love with this combo. I got tired of changing out lenses. Obviously there are pros & cons with each setup. Now I'm thinking of trading in my Nocticron for the upcoming Sigma Art 85 1.4. I have always felt the Nocticron was too close to the other focal lengths and when using the Nocticron I always wanted a bit more reach (kids sporting events, not just portraits). The Sigma 85 + Canon speed booster would make it about 120mm f1.0. I thought about the other Sigma zoom 50-100 1.8, but I think that would be just too big! Am I crazy? Anyone do anything like this? Any feedback would be welcome.