England's series-securing win over Australia in Melbourne was certainly something; and it could turn out to be the defining moment when this squad, nearly five years in the making, changed from potential to genuine contenders for New Zealand's crown.
Their elevation to No 2 in the world rankings is notable given that memories of the last World Cup are still fresh.
This was a hard-fought, deserved victory in less than ideal playing conditions - a fine, moist sheen on the ball that made it hard to handle, and a pitch that cut up so badly it was unfit for Test rugby.
When a side such as Australia dominate the ball and territory, as they have done for two successive games, they usually win. But they did not do so because of the magnificence of England's defence and the questionable tactic of turning down several kickable penalties.
England's defence has been alternately heroic and haphazard, but in Melbourne it was all-encompassing. Several times it seemed impossible for the Wallabies not to score, only for a defender to produce an incredible tackle.
Given the number of coaches and players whose rugby alma mater is Saracens, you could have been forgiven for thinking you were watching Sarries playing in white. It was the same suffocating effort; calm under stress and with an exit strategy from their own 22. The comparison in defence constitutes high praise for England.
And while some doubt the north London outfit's attacking credentials, there are no such reservations about England even though they were starved of ball on occasions, not least by an erratic line-out.
Another factor in England's win went largely unnoticed - discipline. There are several members of Eddie Jones's squad who have reputations for being unable to step away from petty fracas, and Australia did everything they could to goad them - late and cheap shots, holding down at breakdowns, obstructions - but England ignored them all and concentrated on the ball.
That was a significant step forward for several players and must be maintained if they are to be the best.