I recently saw a 5396 (exhibition piece) and my initial concern about the size of the lettering disappeared. The lettering used by Patek even though is significantly bigger than in most of their other watches, appeared to be harmonious with the rest of the dial, it is not overwhelming for the eyes and although I was very sceptical about it at first, I accepted that the watch looks fine as it is. That's my personal opinion based on a "15-minutes personal encounter".
So for all of you who might have (or had) the same hesitation, please wait until you see the watch at a dealer.
Best regards,
Spiros.