Why? What is your use case? (Genuinely curious.)
-- Art: Apple pencil and procreate are the best drawing platform on the market IMO, clips studio on iPad is really close. I'm not a professional but I have tried and owned Wacom's (including cintques) and a Microsoft surface book. The iPad pro's screen and drawing experience is far better IMO.
-- Music: I used to play guitar and still mess around a bit with it, also I've started programming electronic music. Garage Band, DJay Pro 2, and Bias Amp 2 are really amazing pieces of kit. The touch interface for Bias Amp 2 in particular is amazing and feels like using a real guitar amp.
-- Gaming: Card and Board games, Pandemic, Star Realms, Hearthstone, etc.... are absolutely killer on the big 12.9 inch screen. Civ 6 is also an amazing game on the iPad. Along with a ton of AR based games.
-- Reading: iBooks and Kindle
-- Of course all of the standard social media and communications apps. I use the Logitech smart connect keyboard and it's very nice.
-- Software Development: I'm an iOS dev and I use Swift playgrounds on iPad a ton to sketch ideas. When I do webdev I'll often use the iPad with Coda and a remote server and it's a great experience.
With support for the lg 4/5ks I could actually see myself going all in on an iPad Pro for a home setup.
It is simply the best media consumption device I have ever owned.
I bought an iPad 4 at the time (I later upgraded it to an Air and then a Pro) and left it almost untouched for months, then I started using it for web browsing, Youtube, Netflix, Twitch, e-books, light gaming... over time it has replaced not only my PC/laptop, but also my TV, for many activities.
I do not use it for anything professional-related (maybe reviewing some document when on a plane, or an occasional ssh connection to a remote console), but the media consumption part is enough for me.