I have a 36° inclusive edge on my Sage4 and had to cut a piece of vinyl siding for something. I have some left over from siding our house a few years ago. Normally I grab tin snips but they were in a different room. I used the Sage4. That FFG blade went through it like butter. I felt I had to check the sharpness. It still sliced through phone book paper just like it does when I'm done touching it up. I've used Spyderco knives on the siding before but don't remember which ones. The Sage4 did better than any knife I've used before. This is more because of the blade grind, sharpness and steel than the knife model. I just thought I'd mention it and twist the "buy Sage4" knife a little.