AF speed comparison, new and old 14-140mm lenses at 140mm

Lumix G HD 14-140mm f/4-5.8 vs Lumix G HD 14-140mm f/3.5-5.6. Both lenses were used on the GH3, at 140mm, where the focus typically is the slowest. To my surprise, the old lens consistently did the best, in several trials, also in different lightning settings.

[@SkeleCrafteronYT]

How much better is f3.5 vs f4