This Kaufmann album of songs from German operettas would probably make good presents. I very much prefer the far more serious Winterreise, but I am not really an average person.
This Netrebko album will be out in time for Christmas. You can preorder now.
If your friends love Baroque, this Jaroussky album is the one.
Or perhaps they would like Baroque from an entirely new perspective.
For the lover of bel canto you will need Joyce DiDonato.
The Met didn't produce much this year so I recommend these Rossini albums. I even liked the productions. One is comedy and the other tragedy.
If your heart is only for Kaufmann, this is the best of the Verdi year.