I rode overnight Nightjet by ÖBB from Zurich (dep. 20:00) to Berlin (arr. 7:54) in July 2018.
Zurich Hbf. has many end-loading platforms around 20 or so, which is typical in major terminal of European city but not common in Japan. It is one of the busiest stations in Europe and many kinds of trains including international express from Italy come and go.
From Zurich Hbf. I took blue coaches of Nightjet. Meanwhile, it is interesting that ÖBB Nightjet (Zurich – Berlin) does not go through Austrian territory at all.
The sleeping berth was comfortable, and I could use a room of 2 persons berth only by myself because the train was not so crowded. Nightjet does not have a restaurant car and I finished my dinner in Zurich, but next morning good breakfast was served by Nightjet staff.
In European railways, discount system of rail ticket is well developed like air fare. I bought the ticket of this Nightjet by website from Japan about two months before the boarding, and the price was 69 Euro (about 10,000 JPY) from Zurich to Berlin about 900 kilometers. I think this is good price.
If Japan in the similar case from Tokyo to Hiroshima (894 kilometers), it is 18,380 JPY and sleeping car B-berth fare will be 21,780 JPY, much more expensive.