Didn't we have an entire huge thread already full of comparisons of DOA5 and DOA6 visuals? lol. Sure, not everyone zooms in to every detail like that, but it left me feeling like even if some people might see DOA6 as looking better in some ways in general, any praise for DOA6's visuals isn't really deserved for how shoddy a job they did. DOA5 is obviously a huge graphical leap compared to DOA4, but DOA6 feels like it took what DOA5 started, replaced the stages, and threw a coat of new shiny paint (that sometimes behaved like acid) on top of it rather than further refine it.
Personally, my real gripe when it came to DOA6's visuals was more with the animations, like facial expressions, compared to 5. When you've gone from playing DOA5LR for 100s of hours to playing DOA6, you can't help but notice small issues after getting past the blast of HDR bliss.
Oanisd's YT page also has some great comparison videos: