I think i've found another pianist who has large hands and plays with a similar flatish hand technique. I was looking for recordings of Beethoven Op 119.4 Bagatelle in A and noticed a similar way of playing.

It seems the embedded video ignores my time marking. I was hoping to start you at the beginning of the fourth Bagatelle which starts at 5:53.

This doesn't really answer your question, but Horowitz didn't always play with a flat hand - watch him play Mozart - his fingers are curled. I always thought it had more to do with what key he was in and the style of the music he was playing. Romantic music with lots of black keys - flat hand. Mozart in D Major - curled fingers.

Sam

Well, I said all what I think about Horowitz recently, I have nothing to add.

That's a great video Kevin. I hadn't heard of him, but I really like the way he plays.

I love the sound of that piano too.

His hands are interesting to watch.

I think a Fazioli is my dream piano. In a world where I had the means to not just to buy one but the house for it to belong in.

I saw Angela Hewitt play a Fazioli at her concert in New York a few weeks ago. The sound is quite something and she can make it sing.