I'm gonna fly with LX
this Saturday FRA
Up to now I didn't care to make a reservation for a specific seat, as long as I get a window seat, which is my prefered option in my Miles&More profile.
From what I see they block the middle seat in their Airbus fleet, but I'm not so sure about their Avros, which have a 2-3 seating.
Concerning the meal service I'm looking forward getting some nice food. Given the lengths of your sectors I assume that there is only on the LIS
legs the chance to get some hot food.
But you might want to look here : http://www.airlinemeals.net/indexMeals.html
This picture is taken from that site, it was on a ZHR-FRA
flight (number 253)