How much of a step up is Princess Grill vs Britannia on QM2?

We have 5 Cunard voyages under our belt and have our first PG voyage on QE coming up next month which is very exciting. We have our first TA booked for January and are tempted to bid for an upgrade to PG (at around £900 each) given we got a great price on the sheltered balcony already. Our main value proposition would be the dining, is PG on the QM2 substantially better? The overall Grills set up doesn’t seem quite as impressive as the QE but the cabin looks more impressive.

So to feedback on our first Princess Grill experience… Quite simply it was amazing and has spoilt us for our future Cunard cruises 😁. Cabin: We were in 5001, right at the bow of the ship and as such was over 550sq ft, so massive compared to our usual Britannia Balcony cabins. We realise this is not the norm for the PG and there are only two of these but we loved the space. The room attendant introduced himself to us immediately and wanted to know our preferences for