See the difference between the Alpha 7 IV and Alpha 7 III, with lots of side-by-side pictures
Sony A7 III vs A7 IV In-Depth Comparison - Part 1: Photography
Sony A7 IV vs A7 III - Head-to-head Comparison
Sony A7 IV Review & Sample Images by Ken Rockwell
Sony A7 IV Review
Sony A7 IV vs A7 III - Head-to-head Comparison
Sony A7 III vs A7 IV - The 10 Main Differences and Full Comparison - Mirrorless Comparison
Sony a7 IV Review
Sony A7III vs A7IV - A Detailed Comparison - Alpha Shooters
Sony A7 IV vs A7 III - Head-to-head Comparison
Sony a7III Alpha Mirrorless Digital Camera (a7 III Body) ILCE-7M3
Setting up Sony A7iv Enthusiast Photography Blog
Sony A7IV vs A7III for Video
Sony A7 III vs A7 IV - The 10 Main Differences and Full Comparison - Mirrorless Comparison
Fujifilm X-H2 vs. Sony A7 IV