The time and effort would be better spent working on composition, subject choice and general technique. That would certainly get you far better photographs.
To be honest, this sounds like the car modification debate. If you think you're professional and knowledgeable to do better than a major optics company (one of the most respected camera makers in the world) then go ahead. I don't think that many people have that sort of know-how.
EDIT: Apologies for the sarcasm ;-)
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