The smallest display diagonal of cameras of this spec and age is 2", the largest is 4.8", and the average display diagonal is 2.9". With a display diagonal of 3 inches, the F800EXR has one of the larger display diagonals amongst similar spec cameras of this age.
It may also be worth considering one of the alternative 3" screen cameras currently available including because of their better review scores, the SAMSUNG DV300F, or the SAMSUNG WB850F both from Samsung or the Fujifilm F660EXR (£181).
If this camera display diagonal is too small for you then you might want to look at the Df (£2,039) (3.2" and higher rated), the D4 (£4,225) (3.2" and higher rated), or the D4S (£3,379.99) (3.2" and higher rated) all from Nikon.
What does "display diagonal" mean?