Below are crops from our laboratory Still Life target comparing the Fuji X-T30's JPEG image quality to its predecessor's, the X-T20, as well as against its more expensive big brother, the X-T3.
Time to capture, after half-pressing and holding shutter button. The Fuji X-T20's single-shot full autofocus shutter lag was much faster than average for a mirrorless camera in our lab tests.