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What, focusing wise?? If that's what you mean, there's 7 years between them it will be a completely different class. Also focusing can depend on the lens involved. I have an XT4 and many say that it's ability to focus using older lenses like the 35mm 1.4 is much faster. There's reviews stating this as well. Can't speak for the models you mentioned but would assume that as the XPro3 is so new the improvements regarding firmware for focusing are probably quite similar and much improved.
Does anyone have the xpro3? Is it as slow as the xe-1 was, or have they sorted that out?
ping @spenceey?