Yes, K-35's are dreamy, low-contrast, vintage and all that jazz. But a zoom K-35 at a 2.8 is just as exciting. When Zeiss released the Super Speeds, Canon responded with K-35's and to this day, they are used in feature films and commercials consistently.
This lens has an amazing reputation, beautiful/soft renderings and covers a lot of ground in focal length. Not to mention it's macro!