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My test drive of the Sony A7R4 is complete. It's time for the comparison against my A7R2 and some pretty pictures. Put your pixel peepers on and buckle up, this is a long one! First up, cost... 1/n
The A7R2 came out in 2015 at $3,200. Today it can be found for $1799 or possibly cheaper on the used market. The A7R4 was released in late 2019 at $3499, with an MSRP of $2499 today. These data will be important. 2/n 
The A7R4 brings 42% higher resolution over the A7R2, itself no slouch. This is the highest resolution prosumer grade camera on the market atm. But that's not all. It also uses PixelShift to slightly move the sensor and merge several images to produce up to 243MP in one image! 3/n
