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For word sized integers, k=O(1) so radix sort is O(n) and quicksort is O(n log n). If you have a comparison function that takes O(k^3) then you most likely can't even implement a radix sort for it, so the comparison can't be made.

So the fact is that quicksort is a factor O(log n) slower than radix sort. The flip side is that quicksort is more generally applicable to any comparison function whereas radix sort only works for lexicographic sorts. In almost all cases that is exactly what you want, but for example I'm not aware of any way to efficiently sort rational numbers with radix sort.

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