On a side note the EK 330 has probably the most uncomfortable seats in Y.
I agree with that. Took a 2 hour flight last year, so didn't book business class for a short hop and really wished I had
On interiors, it is interesting to note
747 = 6.1m , less estimated 2m for aisles = 4.1m divided by 10 seats = .41 m available per seat
330/340 = 5.3m. less estimated 2m for aisles, divided by 8 seats = .41m available per seat
Having said that, the 747 has virtually straight cabin walls (downstairs), whilst the Airbus has noticeable curved walls (that could add to the perception of space) and I guess the types of seat will have an impact, too.
Even though the EK seats were awful, I found the aisle seat of the pair by the window to feel quite open and airy.