I am a new Leica M6 user, having rented one and then having purchased a used classic. Now I intend to take the classic back for the newer TTL version. My question relates to the difference between the .72 and .85. In general use, I will shoot with the 35mm, the 50mm and the 90mm lens. In shooting the classic with the 35mm lens I like the positioning of the framelines, however with th 90mm lens it is much harder for me to focus. For 35mm lens use do the framelines on the .85 hinder its use in viewing the subject and framing? Is it a big trade off for 35mm lens use to get the .85? <p> Thanks for your response.