The F4 tends to hunt a bit regardless 😉
Mb40 only increased battery life and frame rate when I used one.
My F5 focused faster than my F6 with AFd lenses. Seems about the same with AFs.
Agreed, more weight, faster bursts (which I don't use), but the same focusing. Since I bought a pair of rechargeable CR123 lithium ion batteries and a charger for $25 on eBay I rarely use the vertical grip.
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