Cink and CMK
I failed being able to tell if the MS4 or MS5 was playing in a brief blind test. They are VERY close. That said the MS5's are a "bit" warmer and slightly fuller. We are talking less then 3% difference. The 5's would be needed only if you had a very large room. Unless they are side by side you would not know the difference in sound imo. Even then they are close. PS (Hearing wise I do have perfect pitch.)Yes they do rock and orchestra.
Other speakers in the running before I purchased the Dali's were Maggie 3.6's and Sonus Faber Cremona's. No contest to my ears the MS4's are a cleaner, clearer sound.
Stereophile gave the 5's an A ranking, the same applies to the 4's imo.