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Welcome to the FM Forums, eh?
For a travel APS-C kit, the 10-22, 15-85, 70-200/4, plus any flavor of low-light lens you might need is hard to beat, at least assuming you want to carry 3+ lenses.
As far as the optical quality of the 15-85 goes, it really would have to depend on how the images will be output. If you are looking at getting consistently good 12x18" prints, I'd think you'd have few issues with a recent body. If you are talking about lots of enlargements of 20x30" or more, you might start to find the 15-85 lacking compared to L glass.
But, as you know, the camera/lens that you use is the one that is best for the trip, and the logistics of traveling with camera equipment in a country like India cannot be casually ignored.
Have a great trip.