DxOMark tested the performance of the imaging sensor of the new Canon EOS R8. It gets a score of 93. Not bad. They say
Caono EOS R8 vs Caono EOS R3
Canon R8 Sensor Leaves DXOMark Speechless with Impressive Test
Canon R8 « NEW CAMERA
Canon EOS R3 – ISO Performance and Exposure Recovery Test
Canon EOS R8 DxOMarked, Gets A 93 Score (almost like EOS R3
Canon EOS R8 Review: Unveiling The Comprehensive Features And
Canon R8 vs Canon 5D MIII Detailed Comparison
Canon EOS R8 User's Guide by Ken Rockwell
Canon EOS R8 hands-on: Digital Photography Review
Canon EOS R8 hands-on: Digital Photography Review
Canon R8 « NEW CAMERA
dxomark Archives - CanonWatch
Canon EOS R8 Review