Out of the countless examples I could think of I'll pick out Dancing With The Moonlit Knight, particularly the synth/guitar double solo following the second chorus. That section was written by Hackett and it was one of the few times Steve's wild side made it into a Genesis song. Within this passage, the synth makes it very first appearance on the album, and compared to Tony's other Pro Soloist solos this one has a markedly different sound. He used a preset which was supposed to be an acoustic guitar sound, of course it sounds nothing like that but nonetheless it is quite surprising and unique. I wonder if it was Steve's suggestion to employ this sound as he was always keen on dueting his guitar with a keyboard instrument and he audibly tries to achieve a similar guitar sound. The synth lines are dominating though, Steve's guitar phrases appear rather improvised, Tony's synth lines are composed by every little note. (Actually, Mike's bass playing deserves to be mentioned too, he does some far out complicated stuff in this section.)
In the background, the hammond plays some really unusual chords, even for Tony's standards. The hammond used to be his main keyboard up until Foxtrot; with the ARP Pro Soloist having become his new toy on Selling England, the role of the hammond has changed to the instrument serving for the basic background. Its swirling sound (put through the Echoplex) is nevertheless unique, different from his own previous hammond sound as well as from any other hammond player, to the point it turned into a Tony Banks trademark too, at least at the time. At the ending climax of this instrumental section, as synth and guitar go down to join the bass with just one note, the hammond comes back to the forefront with these strange two chords going back and forth. I'm not sure if it's just the hammond, it might be doubled with the Hohner pianet. Imo this is the part when Tony comes closest to resemble Keith Emerson.
Overall this is one of the strongest examples of Tony surpassing himself because of his competitiveness to Steve and Peter. He felt he needed to prove himself and that made him give 200%.