So, I recently came up with certain high-density concept for business class layout for A330 in particular. Most airlines utilized the front of the cabin for the latest business class cabin with 32C seat with all aisle-access and 36C seat with most aisle-access. the 32C seat cabin usually require minimum of 43" seat pitch for the reverse herringbone seat (Cathay or Delta). While the 36C seat cabin require 45" seat pitch with narrower seat/bed and some seat with no direct aisle-access. Here you could see the stack configurations that helped reduce the seat pitch to 40" while retaining the all aisle-access feature. Making the seat up to 36C seat in A330-300 and 24C to 26C seat in A330-200.
Seat Pitch 40" (Shell to Shell)
Seat Width 20"
Bed Width 20"
Bed Length 80"
Aisle Width 18"
This is just the first stage of the design.