CX 314 J seats
RooFlyer your views on seats? I have selected 16D - always go for middle seats and hopefully get spare seat beside me to spread out.
CX 134 that I took was an A330 3 class 'with new J product' . For business it has seven 1-2-1 rows (11 to 18), then doors and a small galley, then three 1-2-1 rows (19-21) in a 'mini cabin', then curtains to four rows of premium economy.
A330-300 (333/33G) - Cathay Pacific Australia
I chose 19A, first window seat behind the mid class doors/galley, for the 'mini cabin' effect. The cabin was nice and snug, and there wasn't that much noise from the galley (daytime flights that's less important anyway I think). If I flew it again I think I'd still choose a seat in this section.
My flight was only moderately loaded in J - there were only 5 of us in the mini cabin (out of 11).
I didn't go forward into the main J cabin. I'm not sure that 'spreading out' is as easy on the CX J seat configuration as it is on straight side-by-side seats. The CX seats are at an angle, and there is a bit of a privacy and services 'bulkhead' between you and the next seat. You get a bit of an impression of that from the seat map.
The new J seats have lots of room by themselves. There is the ottoman beyond your seat, and the space under that, also a space by your calf that will take a laptop, camera, phone, toiletries bag and headphone case (albeit a bit stacked with all that lot!) and a small flat surface over that space which can easily take a book, iPad and a drink. And there is also a small cupboard on the entry side for shoes.
All in all, MUCH more space than, say QF J and the joke that is LH J on A380.
But you won't go wrong with 16D IMO. If 16G is empty, you will be able to put stuff there, but if its not, you'll probably be OK anyway.