I'm in the midst of purchasing a Hasselblad 500c/m. My issue is that I can afford one lens and I will use the camera primarly for single person portraiture. In 35mm, I use a Nikkor 85mm f/1.8 most often and I love this lens. Would you recommend the 100mm or the 120mm. I'm not so interested in a macro feature and I like the lower f/stop associated with the 100mm. However, perhaps the 120 would give a flatter look (more appealing) due to its longer focal length. Any recommendations from users of either of these lens'. Thanks very much!!