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Currently I have the 24-105 f/4L IS USM mk1 among other lenses, but I am quite disapointed about its image quality, especially compared to the 35 f/1.4L II (which I also have).

I consider upgrading to 24-70 f/2.8L II. Is it worth it? How much difference is there between 24-104 f/4L IS and 24-70 f/2.8L II?

I don't care about the IS, In case I need it I have the 16-35 f/4L IS and the Tamron 85 f/1.8 VC