Bryan's review for the 28-70 f/2.8 is online and I concur with everything I read in it (I haven't had the time to read the whole review yet). The more I use this lens, the less I see when I would use my non-L primes instead. The images I get look great and the versatility, lightness and wide aperture of this lens make it a excellent option for many use cases. Would I buy it if I had a 24-70 L ? Probably not. But I don't have one. I'll probably sell a few lenses in the near future.
I have a few days off coming my way and I'll try to use it as much as possible.