I too have seen some wonderful concerts over here in the UK. just a small selection are, Brendel in Glasgow, 1. - The last Three Schubert Piano Sonatas,
2 - Brahms First Piano Concerto
3 - Mozart - Piano Concertos.
Ashkenazy in Glasgow - The Five Beethoven Piano Concertos and Choral Fantasy in one week. Absolutely amazing all from memory.
Boris Beresovsky in Edinburgh - playing Mussorgsky Pictures and Liszt - Transcendental Etudes. I have never heard such volume from a piano.
Pletnev in Edinburgh playing Bach Book 1 of the Forty Eight Preludes and Fugues.
Perahia in Glasgow playing Bach Goldberg Variations.
Kissin in Edinburgh playing Bach Busoni Chaconne and Chopin Etudes.
and at the end of the concert he played 11 encores.
Kissin in Glasgow playing Liszt B minor sonata and loads of Chopin.
In Wigmore Hall in London
Angela Hewit playing Bach
Igor Levit playing Beethoven last three Piano Sonatas.
In Royal Festival Hall my all time idol Claudio Arrau playing Beethoven last three piano sonatas. I was on cloud 9 all the way back up to Scotland
I have been to many many more but these are the most memorable that spring to mind. All these people absolute masters of the keyboard and you havn't lived unless you have seen and heard a pianist of the highest rank playing a Steinway just yards from you. Also recordings are a poor second to listening to one of the greats live.