First of all statistcly speaking they are tight. But let's suppose they were enough samples as to discard this statistic interval.
1. 5.0 - undistinguish from original 2. 4.9 - I doubt if I ever will hear the difference again or if I actually hear it at all.3. 4.8 - Well I hear the difference, but it was too hard and requiered a lot of concetration 4. 4.7 - The sample isn't transparent at all but the quality is high. And it's point for me to say "not transparent"
The end conclusion depends completely on the selection of participants (I discard controllable parameters like listening environment and used tools).