The Ministry for State Security in former East Germany had cells they'd dissappear people into. If you ignore the physical torture they employed in the earlier years, the actual cells themselves were somewhat more comfortable than what the Japanese got.

The Stasi had beds, some sense of privacy through proper doors, and an hour a day one might spend outside in a small courtyard to get some sunlight.

However the level of psychological torture (sleep deprivation, hours of standing/sitting in a prescribed posture, hourly checks, ...) appears to be milder in Japan. The Stasi could take that pretty far once they weren't allowed to use physical torture anymore.