I read your review with great interest... (good review!)
I still have my "adaptall" 90mm Tamron macro lens.... back in the days of film it was the best lens that Tamron ever designed. It is still a fine lens (but completely manual) on my 60D, but I ended up getting the 100L for it's improved image quality and IS.
To say that a 40 year old lens is "a fine lens" speaks very well for it.... I would expect an improved version of the lens, like the one you tested, to be a very fine lens. Here's hoping that the Tamrons and Sigmas of the world put out more quality lenses at affordable prices...
Thanks for the good feedback, Don. Your final statement really mirrors how I feel. My current kit (the modern version - I have a vintage kit, too) is dominated by Canon glass (5 lenses). I also own one Tamron and one Rokinon. But here's the thing: that Tamron replaced the 24-105L and the Rokinon replaced the 17-40L, and I have been very happy after time that I made that decision. That's great news to me. I think that it means that new lenses by Canon will be even better with more pressure.
How much better will the 35mm f/1.4LII be because of the S35?
I too own the 100L and it will be a long time before I part with it, but I still like the fact that this very competitive alternative exists at a lower price point.