score:4
Economy class legroom in commercial airlines typically varies from 28" to 34", so if SeatGuru's saying 32-34", that's definitely at the generous end of the scale. That said, sybaritic luxury it's not.
As a fellow tall person (but not quite as a tall as you), I find under 30" to be tough going, although it's tolerable for short haul. 32" is OK for most flights, but I recently flew a 15-hour long-haul in Singapore Airlines with that pitch and it was pretty squished, especially when the person in front reclined: I had to spread or tilt my legs because I couldn't sit straight, and I could not comfortably use my laptop because the screen was too close and my elbows hit the seat if I tried to use its keyboard. But on the way back, I was on ANA in a 34" seat, and it was comparatively comfortable.
So in your figurative shoes, I would probably pony up for the upgrade, at least for the 19-hour ultramarathon which is literally among the world's longest flights. At β¬136, it's less than β¬10 per hour, or the cost of an extra night at a hotel.