It is all a question of experience, memory and palate. I am a bit rusty probably these days since the 2006 was the last DRC vintage I bought and tasted at release- but once I had several years of tasting experience and the DRC TNs got into the 100s, I could spot them pretty easily- and sometimes on nose alone.
What I think makes DRC so unique is that the wines can be so incredibly refined and elegant- yet also really push the envelope in fully and dramatically presenting all the details. The Montrachet is the most obvious example of this- but I think it is present in all of the wines, with Romanee Conti being so extraordinary because you almost taste and experience it more after swallowing it. I know that does not make sense, but it is the closest I can come to describing the phenomenon.
From a qualitative standpoint, DRC has few peers- but they do exist- and a number of wines come awfully close. Generally speaking, where the DRC will have a slight edge is in that the full details of Vosne-Romanee and the particular site are so fully displayed- the peacock’s tail I believe was the old expression used to describe the particular beauty of a mature DRC.
Also, there is greater consistency- markedly so. I am no authority on DRC- far from it- but I have a few hundred (low hundreds) of TNs covering the mid-70s to 2006, and while of course overall quality and potential is impacted by vintage- I can only point to a single wine that I thought was truly flawed. That was the 1987 La Tache- tasted 3 times and each time progressively getting further out of balance. The 1992 Grands-Echezeaux came out a bit green in time where the others were charming midweights- but that is the only other DRC I have ever had that I thought approached a point of being flawed. Even the 1994s have aged nicely (and very slowly) into useful and interesting wines.
There is no doubt DRC pricing has reached a new general height from which it will never fall. The real danger I see, as noted in my prior post, is that more and more merchants will stop bothering with the wines leaving them to be concentrated into fewer hands as happened with Leroy. But if you ever find yourself in a position to try one, I think it will be worth it. That said, with Meo-Camuzet for a start, and a few others, you can still have a very happy Vosne experience without having DRC in the cellar.