As of v0.94 turning speed now depends on ship dimension. The turning speed per axis now depends on the dimensions of the Ship. This means if you build a long stick for example, you will have a good speed to look around, but less speed to roll. This means that the only logical way to build a ship is to create a pencil, as nobody cares about roll speed. This can now be offset with the new Thrust Customization feature  However, the pencil build is still mechanically the most optimal.  The maneuverability of the pencil design requires many ships to defeat it
This feature can be disabled in server.cfg by changing:
TURNING_DIMENSION_SCALE = 1.1
TURNING_DIMENSION_SCALE = 0.0
Also, mass does still play a factor, but much much less than in older builds.