Well, better than most timber frames. If you were to ask for a truly soundproof wall you are likely to get a timber frame in two layers with rockwool fill and double thickness plasterboard.

It was also common to build lathe and plaster covered interior partitions in the past. Way before plasterboard.

A modern one off house may well have concrete block downstairs walls to hold the floor up. Albeit, they may get covered with plasterboard 'dabbed on' anyway, to reduce drying time