I got to sit down and really experience the 12.9" version on Easter. I'm not that impressed. The display on it wasn't much better than the Air 2, it wasn't very heavy holding with two hands but felt heavy when you'd try to hold it on the side because of the lever effect since it's so wide. My wife's uncle showed me how he cradles it and it just seemed lame. It needs to be lighter, charge faster (or come with the faster charging kit), needs the lower reflectivity of the 9.7" Pro, the Tru-Tone capability, and most importantly, it needs better software geared towards professional workflows.
iOS is focused more on consuming and sharing content. It doesn't have proper tools to work on projects with lots of files, easily move files around between apps, save out different versions of comps and easily switch between them or show them side by side, plug in different devices like external drives when you need to grab files, etc. Sure it would be great if all files were in the cloud but the real world doesn't work that way and sometimes you need to grab the original comps you had some intern work on in Illustrator CS6 several years ago for a branding campaign that was shelved until a later date and those were copied to a random external drive when their old machine broke and had the hard drive cloned. That's real world stuff right there and the iPad Pro can't even come close to dealing. iOS X better have some great improvements for iPad Pro.
