Fringer recently released a video showing off how well the Tamron SP 35mm f/1.4 works on the Fujifilm X-T4. Today they posted a new video comparing the performance of the Fujifilm X-T4 and X-T3 and the XT4 is looking super sticky compared to the X-T3. The most recent test was done with a Fringer Adapter and Canon EF50/1.8 STM lens.
Native Fujifilm glass might even show a greater difference between the two cameras and the AF system used in the X-T4 could come to the X-T3 after launch via a firmware update. Also, the X-T4 being used is preproduction so the overall performance could get even better at launch.
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Fringer AF Adapter: Amazon
Fujifilm X-T4 Preorder: B&H Photo / Amazon / Adorama
VG-XT4 Vertical Battery Grip: B&H Photo / Amazon / Adorama
NP-W235 Battery: B&H Photo / Amazon / Adorama
Fujifilm BC-W235 Dual Battery Charger: B&H Photo / Amazon / Adorama