DxOmark published the full EOS-RP sensor test:
As the first and only entry-level full-frame mirrorless camera currently available, the Canon EOS RP provides an easier entry into the full-frame mirrorless market than the EOS R from a pricing point of view. However, it might be too much to expect the RP sensor to match the current leading-edge sensor performance in the considerably more expensive mid-range mirrorless models. At the moment, those wanting better sensor performance from a Canon full-frame mirrorless camera, particularly with regard to dynamic range, will have to spend considerably more on the Canon EOS R.
This said, noise levels and color accuracy are very good and not that far behind the sensors in the Nikon Z 6 and Sony A7 III. These traits, combined with its inherent portability and generally good mix of features and ergonomics, make the RP an attractive option for travel, street, and yes, even landscape photographers.