[gubikmic]

The Leuchtturm one is totally overrated, very thin paper. Try Clairefontaine. They don't market as well but the paper is much nicer.

[Arainach]

There's "not marketing as well" and "not even trying to sell their product". Clairefontaine is the latter. Their website is an utter mess. I attempted to find A5 notebooks and even when filtering to the theoretical dimensions (148x210) most of the results are A4.