Captain Alastair Cook said "there is still a hell of a lot to come" from his England side after they sealed a series win in South Africa.
Their seven-wicket victory in the third Test gave England an unassailable 2-0 lead in the four-match series.
Stuart Broad took 6-17 to help bowl the number one Test side out for 83 on a pulsating third day in Johannesburg.
"If we keep doing the right things we should be able to do something special," Cook told Test Match Special.
"It's a privilege to captain these guys because they can change games as quickly as that."
The Test series victory is England's first overseas since they beat India in 2012-13.
Broad took the man-of-the-match award for his sensational spell on the third afternoon, which included taking five wickets for one run in 31 balls.
"Winning in South Africa has been a dream of mine, so to do it in their own back yard is very special," he said.
|England's high points under Cook's captaincy|
|Dec 2012: Win 2-1 in India; first England series win there since 1984-85|
|Aug 2013: Retain the Ashes in England with 3-0 series win|
|Aug 2015: Regain the Ashes in England with 3-2 series win|
|Jan 2016: Beat South Africa, the world's top-ranked Test side|
South Africa, having bowled England out for 323 to limit them to a first-innings lead of 10, were 23-0 shortly after lunch.
But Broad claimed the first five wickets with a hostile spell on a Wanderers surface offering pace and bounce to effectively settle the contest.
Cook said coach Trevor Bayliss had given the team a "kick" in the lunch interval, adding: "Rather than sulking about it the lads looked at themselves, led by Broady, and there was a real intensity in the field for that two-hour session.
"It was a realisation from a guy that doesn't say too much that this is the time: if you want to win the series then you've got an opportunity."
South Africa captain AB de Villiers said: "I haven't seen a team bowl like that for a long time. We were outplayed in the second innings - credit to them."
Broad added: "I'd take that wicket everywhere with me. It offered a bit of seam, a bit of bounce, and it was swinging a little bit."
Broad, 29, said Joe Root "probably deserved" the match award for his counter-attacking 110, which rescued England from 91-4 on the second day in alliance with Ben Stokes, who made 58.
|The story of the series|
|First Test, Durban: England won by 241 runs|
|Second Test, Cape Town: Match drawn|
|Third Test, Johannesburg: England won by seven wickets|
|Fourth Test, Centurion: 22-26 January|
|Full tour schedule|
Broad said: "It's sort of what you've come to expect from Joe. That will go down as one of his best hundreds."
Although Steven Finn took a wicket with his second ball on Saturday, he spent part of the South Africa innings off the field with a side strain.
Cook said the pace bowler is "unlikely" to play in the final Test in Centurion starting on 22 January.
Listen to Geoffrey Boycott and Jonathan Agnew review England's victory in the Test Match Special podcast.