sony is best, i love this tab because of built quality and features like super slim, water proof, great screen. better then ipad .
Very disappointing that there was no voice call functionality, strange considering the phone icon is there on the home screen. If that's the case then I shall have to look elsewhere for an all in one tablet.
To bad about the camera. I was set to buy this over nexus 9. Now i have to wait and see. But the battery and design is absolutely stunning. But if nexus 9 can match battery and better camera it's a winner imo.
In the conclusion you mentioned "Water-proofing is a unique feature among this range of tablets". I guess you forgot about the Samsung Galaxy Tab Active.
Unfortunately the other specs (screen resolution, processor, ram, cameras) of the Galaxy Tab Active leave a lot to be desired.