I should also add that in my 30 years of photography, mainly recording day trips, outings, holidays and hobbies rather than serious stuff, I have used non Canon, non L lenses such as Pentax, Tamron and Sigma and they have all served me well – I still have them!
I think that the current family of modern lenses from folks such as Sigma, do provide superior image quality as I understand that their designs are optimised by computer aided design software and they use modern materials, manufacturing methods and testing procedures.
So, although we do joke and banter about the L lenses here on IIS, they really are not absolutely necessary unless you are into examining every single pixel or need the waterproofing, heavy metal or have to use them wide open.
Cheers
Dennis
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