totally worth the upgrade if the price is right or you have the Avios - it’s a long flight; the F cabin on the A380 is NOT fitted with the new doors, but regardless it’s a large seat with good privacy and I would go for it. Especially since Club Word on the A380 is the old style, so the step up to F is noticeable (unlike Club Suites, where I find the upgrade to F very hard to justify, door in F or not)