Here: https://screenshotcomparison.com/comparison/8778/
It looks better in many places because the upscale smoothed some of the hard edges in the Blu-ray, a result of crazy edge enhancement and artificial sharpening applied back in the early 2000s, very common stuff in the DVD era.
Well the reason I posted that was because, since the 4K Blu-Ray sources of ANH and ROTJ will be used for ANH:R and ROTJ:R respectively. And for a moment I thought, why shouldn’t ESB:R somehow get this treatment. I understand already that Topaz and re-rendering of shots was done but, the ESB 4K Blu-Ray exists.
And besides, after two years home-studying about video and audio for films (for my own pleasure), I’ve found that some cases, DNR doesn’t always work, as they sometimes leave an artificial look.