DPReview added the Fujifilm X-T3 to their studio scene comparison tool and the results look like a mixed bag. Sometimes the Fujifilm X-T3 retains more detail than the X-T2, while others the X-T2 seems to be handling noise better than the X-T3.
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Fujifilm X-T3: B&H Photo / Amazon / Adorama
Fujifilm X-T3 + 18-55mm: B&H Photo / Amazon / Adorama