Not necessarily. The MacBook Pro 13 is a .1 inch bigger then the iPad Pro 12.9. Screen size does not make a big difference. Granted you have more real estate, but the function does not change.
Function is pokey on smaller screens. Some are 'ok' with with that. I don't count myself amongst them. Having wanted bigger iPhones, iPads and iMacs. And they've all arrived in time as customer's screen real estate demands increased and technology has got better.
Screen size clearly makes the world of difference. And that's why we have 27 inch iMacs and 16 inch Macbooks and yes, 12.9 iPads.
My only computing device is an iPhone at the moment.
It's tiny. 'Ok' for what it does. It's 'just a phone' to me and I watch YouTube on it. Check emails. But it's very pokey.
The iPad 12.9 is 'ok' but it could do with an extra 4 inches. It's currently the size of A4 paper. A3 would make it a killer device. Maybe when the software catches up to justify that size...but its software is already started to 'but' up against those 'cosey' 12.9 inches. Given how many iPads sell, it's rather a 16 incher than several different models shuffling between 9.7-11 inches. 11, 12.9 and 16 would be 'just fine.'
Poking around on Logic or Final Cut on a 'tiny' (size being relative to the sun...) screen may be 'ok' for some but it's far from ideal. As the iPad gets more 'pro'-fessional (in iOS and Pro-Apps...) it's going to have to push past that 12.9 glass ceiling to be treated more seriously as a creative or 'pro' platform, preferably '16' inch. One day, it will be the 'iPad' on the stand iMac with sizes up to 21 inch and beyond. But in the meantime, a screen bump would suffice.
I had the iPad 3. It just wasn't big enough. Not even letter sized A4.
I'd get an iPad 12.9 to do 'Wacom' style illustration both on the iPad and via it to the Mac. But it would be 'adequate' rather than ideal size wise. The 11 incher feels rather cramped compared to the 12.9 which breathes alot more.
But a 16-17 incher would be a sweet spot for me, personally.
Azrael.