I tried one out at an Apple store for about 20 minutes. I'm really torn. I could definitely feel the A9X and 4GB RAM. Everything was so fast and fluid. The screen looked amazing. Loved the pencil. But I use an iPad Air 2 every day and a lot of the time I'm using it by holding it in my hands and typing with my thumbs. I really want the Pro but am afraid it won't be portable enough. At my Apple store they didn't have any iPPs next to iPad Airs. I'm going to check my Best Buy tomorrow to see if they do. I'd like to see the two side by side in person.
I was in the exact same position as you. I REALLY love my Air2. Love that I could hold it for hours on end (even one handed) without feeling any strain on my wrists. To this day, I still marvel just how THIN AND LIGHT it is.
However, after using my Pro for 2 days now, I'm falling in love with the expansive screen. This thing simply draws you in. No words to describe it, you simply must use it to understand. Even simple web browsing honestly becomes a different experience. The first time I held the pro in my hands I had no doubt in my mind that the pro was arguably in a different category of tablet.
It's funny how i used to think that the Air2 felt quite big and unwieldy the first time I held it (compared to the Mini2). In fact, I remember reading reviews of the device when it first debuted, citing just this.
When I tried using my Air2 tonight, I couldn't believe just how small the screen seemed. Almost felt claustrophobic in a way, compared to the Pro. Funny how perception can change so dramatically within a short period of time.
2 observations: 1) The multitasking speed and efficiency is equivalent IMO between the two devices. I really had no complaints while multitasking on my Air2. 2) while I can see a noticeable speed difference between the two, this difference is quite minimal. The Air2, I've realized, is no slouch. It's almost as snappy, almost as quick. I guess the difference will become more pronounced as Apps become more geared towards the Pro.