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"If you're resolution hungry, Sony's A7R IV is pretty unbeatable for image quality" according to Digital Camera World.
"The Sony a7R IV is among the most capable cameras we've tested. It makes a compelling case that the days of choosing between speed-oriented cameras and resolution-oriented cameras are coming to an end. It wouldn't be our top choice for sports and action purists (all those megapixels result in many megabytes of storage), but for those users that need this resolution on a regular basis and want to be able to photograph fast-moving subjects when necessary, the Sony a7R IV is the best option on the market right now" according to DP review in 2019.
See: Panasonic S5 Mark II X vs Sony A7 IV Comparison.
See: Sony FX30 vs Sony A7 IV Comparison.
See Sony FX3 vs Sony A7 IV Comparison.