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The former lock sat with Saracens through Ulster's 19-10 triumph that took them to the top of Pool 3 - a point ahead of Saracens.
"For 60 minutes Saracens were in control but then they let little things upset them and Ulster came racing back into it," said Johns.
"Ulster will be confident going to Saracens next week after this triumph - and having won down in Munster the previous weekend.
"But, make no mistake, it is going to be hell of a challenge at Vicarage Road. Saracens will be all out to get their revenge and they led at Ravenhill from the 14th to the 77th minute, so they were not that far off.
"Ulster are developing into a very capable side - they are fit and highly competitive.
"And Saturday's game could be a real turning point for them if they could win on English soil. Then the destiny of the group would be in their hands with a home game against Biarritz and a trip to Treviso to come. It promises to be a great afternoon of rugby."
While Johns has those mixed feelings, Saracens Director of Rugby Steve Diamond was left with feelings of regret in his failed recruitment effort to entice David Humphreys away from Belfast and to London.
Diamond was full of praise for the Ireland outside half after he turned on a master class of control in the second half in particular - Diamond had tried to sign Humphreys for Saracens when he first joined the club from Sale.
"Take nothing away from Ulster, they stuck to their game plan and David was magnificent.
"He can kick goals from 55 metres and his tactical kicking put pressure on our back three. He showed at Ravenhill why I tried to sign him for Saracens two years ago.
"Massive credit to him, but I am still confident we can win at home."
Diamond will be banking on his captain Hugh Vyvyan making home advantage count and for it to be Vyvyan's turn to smile after his former Newcastle University flatmate and Ulster skipper Simon Best was the one left with the spoils after Round 3.
"It was a good physical game and both sides respect each other," said Vyvyan.
"The stakes are that much higher when playing in a Heineken Cup game. It was very intense but I have no doubt Ulster would be a top four team in the English Premiership and that was certainly as hard as playing against one of the top Premiership sides.
"I thought both Simon and try-scorer Rory (Best) played really well and it is 1-0 to Simon - but we will have to wait and see how the score ends after next weekend's game."
