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Using an X-Pro1 with a Zhongyi Lens Turbo II to a Voigtländer Ultron 40mm SL I.
I previously used the same lens on a Sony A6000 with the respective Lens Turbo II.
The autofocus speed on the X-Pro1 was decent, but the accuracy was hit or miss with the F2 primes.
Using manual lenses on it (even zooms!) is a workable experience. The EVF is low-res, but with punch in focus I have never had an out-of-focus image. The EVF doesn't enter 60 (50?) FPS refresh rate until you half-depress the shutter button, so the preview is often slow and laggy. The handling is perfect with primes, but with older metal zooms the weight distribution is often towards the lens. Holdiing these range-finder style cameras (X-Px/X-Ex/etc.) while trying to rotate the zoom ring is wonky, but workable. I would get a camera with a larger grip - maybe an X-T1 - if zooms are in your future.
Otherwise, used for around 400-300 USD, it is great. It is cheap enough to be worth it only for manual.