Inside ipad pro 9.7 there is Apple A9X chipset with 2 GB DDR4 RAM and options for 32/128/256 GB SSD. The performance of the ipad pro is slightly less than the Microsoft surface pro 4 but much improved than on the ipad Air 2. Apple also claums that the Pro has more GPU horsepower than the Xbox 360 and sometimes it is true. All games plays smoothly without framedrops. Even on the multiple apps opened in the background the performance is same. And hence the multitasking is so smooth.
But ios can't replace the windows 10, because You will need some plugins for the browser.
ipad pro has 9.7 inches 2048* 1536 resolution IPS dispaly with DCI-P3 Gamut and true tone feature. This makes the screen warmer and cooler depending upon the conditions.
The big upgrade on thia ipad is the speakers. Now you are getting 4 speakers setup. And the volume is louder compared to the last version.
The camera is 12MP shooter. With 4K video recording. Not much upgraded from ipad air 2.
Finally it can not reaplace the Laptop or Desktop PC totally but it is for those who want Portability with Perfoemance and productivity.