My Note 10.1 has replaced my laptop quite well... Why? Because I can do a real multitasking and use windows side by side - and it is easy to use BT keyboard and mouse if im going to write long text/writing code/editing html etc. Still it cannot replace a laptop totally, because I use some specific apps by a laptop that doesnt exist for tablets. Also when writing an article or powerpoint presentation by my Note I still have to edit them in a computer to get the final version... But that can change.
Im really waiting to see Surface Pro 3 IRL because it is a full operating system, but I want to know how well it runs some specific programs. My Note offers me something that my laptop cannot offer - i can easily do sketches and add them to presentations etc. I rarely use papers at work, I use my Note for everything. What comes to iPad, it was more for fun. I didnt feel that it was a productive tool, it was more for leisure use. I sold it because iPad Air had some serious bugs and didnt want to wait and see if they are fixed with iOS8 or not. I probably get the second generation Air when it comes, but for now im more interested in SP3 (i7/8gb/256gb/pen).
Get the os10 experience onto the ipad and/or just adding some connectors such as usb 3 and a sd card reader would be an improvement. Alternatively bring the apps environment over to a touch based Air style computer which has a detachable screen and equally this would be just as interesting. For me personally the current iphone is too small to be a genuine tablet replacer while the ipads lack hard connectivity to be overwhelmingly a notebook replacer. Anyway my 2c