In this test by Tony Northrup, you will see the new Sony A7r IV raw files compared the the Sony A7r III raw files in a number of ways including sharpness, noise, dynamic range, banding and more. Tony also discusses a autofocus issue they were having with the Eye-AF feature in particular which is why their full review of the Sony A7R IV is going to be delayed a bit.
Sony a7R IV Image Quality, Dynamic Range, Banding (vs a7R III)
The New Sony A7r IV is going for $3498 US and aviator oyna can now be pre-ordered at BHPhoto Here >>