I always love when this statement pops up.
James you made a great decision in purchasing an XL2. If it does what you need it to do and you're comfortable using it, then by all means it was a good buying decision.
I'm of the opinion that for most narrative filmmakers, the most important tool to have is a firm understanding of lighting and controlling it and this is achieved easiest by becoming familiar with an entry level lighting kit. If you can keep the windows from blowing out, have a perfectly placed eye glint and just a touch of rim on someone that's lit to perfection, it won't matter what you shoot them with, it should look good. But by no means is that box or bag of Lowell Totas on the floor as sexy as an XL2 or an HDX. Interesting though, that without the Totas or any other lighting instruments, footage from either would look about the same, and not all that great.
Just my 1 penny.