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Barry,
Buying L-series glass, regardless of it being slower than your current workhorse, is never a step backwards. You will appreciate the edge performace, and enhanced contrast, sharpness and saturation enhancements that fluorite brings.
Not to mention reduced chromatic and spherical aberrations.
All my landcape work has been done with the slower 17-40mm f/4L.
Regards,
Humayun
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