Hi Tom,
I would say keep the f1.8, and sell the f1.4 for three reasons.
1-You can get a bit more $ for the F1.4 lens.
2-The 1.8 is supposed to be the sharper of the two lenses.
3-The 1.8 should be slightly smaller & lighter than the 1.4.
Just my $0.02
Regards,
John
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