It's a hearsay/QC variance. TDP samples of the 24-105STM and RF100-400 look awful. Yet the copies I have(I sold 24-105STM once and repurchased) are nice enough that they're up to EF 24-105L mark 2's level in my "limited" experience.The most shameful failure for Canon in the year 2023 is simply
that Sony 200-600 with 1.4TC resolve noticeably better than Canon 200-800 without any additional optic.
Many TDP sample photos on Canon lenses are worse than Sony counterparts...
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