I am done with Bayo 1 (33 hours on save file):

Haha,
not even close!
I've yet to delve into harder difficulties, yet to beat an hour long Lost Chapter endurance level, yet to beat final final secret boss, yet to unlock like a dozen of hidden weapons and unlocks.
And that's just for one playable character. Add two more -- you can triple all that.
But most importantly -- i've simply yet to
git gud at Bayonetta for real.
Pure Platinum-ing last boss was hard because of insane combo requirement. The part makes it hard is that most of the attacks Jubileus does are very disruptive and will almost always make you break your combo.
I had to do some rather advanced (for me)
panther offsets to keep my combo up and reach enough combo points required.
Now that i "beat" the game on Wii U, i can compare it to original X360:
UI (UI is my proffesional specialty so i never miss out to ramble on it):
Button prompts with grey colourless boring buttons feel very off after playing Bayonetta 1 on 360. Red/yellow/blue/green button prompts stood out instantly while still having the same Art Nouveau styling as the rest of the game. As busted as PS3 port was but even there UI was made fit into the game too.
On Wii U button prompts stick out like sore thumbs -- they are not reworked into game's overall aesthetic and are just copy pasted from the manual or something.
Also because modern Nintendo control layout (outside of New 3DS) has no coloured buttons game loses one of the means to communicate with you. Like in one of the annoying instant death QTEs you actually get a warning a full second in advance before QTE prompt even shows up in the form of a shrinking circle:

The colour of a circle is actually telling you which button exactly you need to hit.
Colouring scheme is not all lost -- both Bayo 1 and 2 uses Famicom coloured button layout on
some screens but this colour scheme is simply not present on actual physical buttons on your controller so that kinda falls flat.
During dreaded by some (not by me, as you see i've Pure Platinumed them rather easily) bike and missile sections you have a huge button prompt to press Y which shows you help screen showing how to control. This is actually kinda annoying because i kept pressing Y many times by mistake and it took me quite some time to exit this dialogue.
Also for some stupid reason they added motion control for these sections and they're also on by default.
Game shows the same picture on Gamepad as on TV, but it also shows rather ugly and not-fitting Miiverse icon in the corner at all times. I would be fine with it if only they reworked the icon to make it fit more into the style but they didn't...
It's not all bad though -- surprisingly touchscreen controls despite being worthless way to control the game have a very cool application in this port. During button mashing finishers you can mash both the button AND touchscreen prompt directly on gamepad, boosting your mashing considerably. Without it my maximum of mashing was 1100 points, with this trick i have seemingly hit the mashing ceiling of 1500 points.
This isn't just for kicks because these points go into your combo and have your current combo multiplier applied to them meaning that if you reach 9.9 multiplier by the end of a fight you get extra 15 000 points for free, basically.
Graphics comparisons:
It feels on par with Xbox version. Can't really tell you juicy details about framerate -- i kinda stop noticing it after 30 fps. It feels fine, same as in 360. I am sensitive to slowdown though.
There were a few isolated instances where game slowed down considerably, it felt like i was suddenly submerged into honey and could barely move. It happened to me in Jubileus boss battle where game bombarded me with epic galactic scale effects and during boss battle with plant angel. It felt like in these two cases i had more severe slowdown than in Xbox 360 original.
Aside from all that there are some minor control differences between two version -- like the same combos now require somewhat different timings and somewhat different input buffering behavior, but it's not a big deal and i can adjust between them in literally seconds.