How much do you use the 28-135? If you use it a lot and find it lacking then I think the 24-105 is well worth considering. I agree that it may well not offer much improvement for landscapes (though it will be sharper and colours should be better), but it is a superb portrait lens and will be great for shots of people. One big word of warning if you do go for one, L series lenses are seriously addictive...
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