A340-500 Business Class:

Seating: 2-2-2
Seat pitch: 38" = 96 cm
Seat width: 20" = 51 cm
Seat recline: ? (no information, but for sure not flat enough)
TV screen: 14" = 35,5 cm

My opinion:
The seat is very "high tech" inside a shell, so the seat in front of you can not recline into you. All seat positions are handled with a hand held mode controller (same for the IFE). The seat has a very nice and effectiv massage system.
But the recline is poor. Because this aircraft serves ultra long flights, I wished to have something like a flat bed.
The seat pitch is poor. Large people will touch the shell in front with their feet. This makes the two seats on both window sides uncomfortable: the person in the window seat has to climb over the legs of the person in the aisle seat, if he/she leaves the seat.
Best seats are the two in the middle row: you can leave the seats to the left or right, without disturbing your neighbor.
Very good IFE-system (ICE) with 500 channels: over 50 TV channels, 350 radio and CD channels and more than 40 games. This makes a long flight short.

A340-500 Economy Class:

Seating: 2-4-2
Seat pitch: 31" = 78 cm
Seat width: 18,5" = 47 cm
Seat recline: ? (no information)
TV screen: 9" = 23 cm

My opinion:
The seat is good for "normal" flights, but for long range (13-15 hours) a seat pitch of 31" is unacceptable!

Good seats with lot of leg room: bulkhead 15 D,E,F and 16 A,B,J,K and 23 D,E,F and exit seats 24 A,B,J,K.

Bad seats: in the rows behind bulkhead because of large equipment box under the seats in front: 16 E,F (16 D,G are better, you can stretch the feets out a little, because there are only 3 seats in front) and 17 A,B,D,G,J,K.
Same bad seats in the second cabin: 24 E,F and 25 A,B,D,G,J,K.

Be aware: all window seats (A/J) and the middle seats E/F have an equipment box under the seat in front, which limits the foot room by 50%!

If you like to look out of the window, avoid seat 18 A and 18 J: instead of two windows there is only one. You can only look out, when the seat is fully reclined.

Very good IFE-system (ICE) with 500 channels: over 50 TV channels, 350 radio and CD channels and more than 40 games. This makes a long flight short.