That will count little for a South African side at the peak of their powers and they will see New Zealand as vulnerable given the Black Caps are desperately shorn of quality and experience with Taylor, Jesse Ryder, Tim Southee and Daniel Vettori all missing.
Williamson said their goal was to "challenge'' South Africa and "compete really well'' and hope that put them on course for victory, but he is realistic.
"We have played a lot of teams in different conditions but, to me, that attack we faced [in the home series last summer] was the best I had ever come up against and the most demanding,'' he said. "And then they have the batsmen to go with it. I don't know how many they have in the world's top 10 at the moment. The level of cricket they bring is of the highest quality and it's a great challenge.
"It's always great to play such a fierce opposition and it's where the level of cricket is at at the moment, playing the No 1 team in the world.''
Williamson got a gentle introduction to South African conditions overnight (NZT) when he played his first innings since arriving in the country. New Zealand scored 311 for six batting on a docile pitch on the first day of a three-day match against a South African Invitational XI in Paarl, with Williamson scoring 59.
He put on 108 for the third wicket with skipper Brendon McCullum (65) and all of the New Zealand batsmen got starts.
The Cape Town pitch promises to offer a little more life, and Williamson will hope it results in good memories.