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Great! That's an unbelievable discount off list price, with free shipping, no less!
From reading reviews, owner reports, looking at test shots, and glimpsing MTF charts, it looks like the 28 IS a winner and stronger (by a hair!) IQ than the 24 IS. It seems near-"L" IQ in a compact package. I'm anxious to find out.
I'm heading to Yosemite in later March, and you can be sure this lens will be along for the ride! I would make this my go-to trekking around lens, backed up by the 24 TS-E II, Samyang 14, and maybe one other. Last time I went, I shot most with the 24 TS-E and Leica R 60 macro, and least with the 14mm. After seeing your gorgeous El Capitan and Merced River shots, I may change -- perhaps there will be pooled water in the valley for some great reflections, demanding the 14. Or snow, and rain, with a little sun, like last time.