The screen of that seems to be about 203mm×270mm (13.3 inch diagonal, 1650×2200 pixels). Smaller and with a different aspect ratio (3:4 instead of 1:√2).
Interestingly, several major reviews on page 1 of Google call it "A4-sized", but only one review actually called it "near A4-sized". Standard of writing these days is horrendous for such a key spec.
