joe,
I owned a CV 28 for a brief while and sold it. NOT because it was a poor lens but because it was(for me) too close to the 35. And it's much closer to the 25. I am now very happy with 12,35,50 as a progression from wide to normal.
My take on this is:
Keep shooting the 25. If that Canon is calling out to you answer. But not in my opinion because of the FOV.
Or just spend the $ on beer and hookers. Oh, wait, forget the beer. 😀
Rob