How do the visuals on the Nintendo Switch compare to those of the Xbox 360 & PS3?

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Azuren said:
If it manages to run Dark Souls 1080@30fps, I'll admit to it being a fair bit more powerful. Until then I feel it's about the same.

It runs Skyrim at 900p/30fps with improved textures, water, and foliage compared to 720p/20-30fps on PS3/360 with worse assets. How is that "about the same"?