Although Gareth Bale's impending departure for Spain will leave a big hole on the left of their midfield, King believes the additions Andre Villas-Boas has made will be enough to see them top Arsenal in the Premier League table.
Three more players were unveiled on Friday - Erik Lamela, Christian Eriksen and Vlad Chiriches - and they could be involved when Spurs look for a victory at the Emirates Stadium on Sunday.
King did not feature in a win on Arsenal soil in his 13 years as a Tottenham player, nor did he see them finish above their rivals in the table, but he feels all that could change this season.
"The players have been brilliant so far this season and the club have brought in top-class signings so this weekend it's a big game, one to show who is the dominant force," King said.
"We are looking to go there and prove that we are a stronger side.
"They were a team that was competing at the top of the table and we were a top-10 side so it's great that we have been able to close that gap over the last few years and we are going into each derby neck and neck now so that gives each derby a bit of extra spice.
"All the new signings have slipped in to the team seamlessly and those are all good signs. I am sure they will love it.
"The start we have made this season has been positive. We have had two good performances in the league, two clean sheets and a striker (Roberto Soldado) who is finding the back of the net.
"It's going to be a long, hard season. We won't get carried away too early, but at the moment it does look positive, they are looking to bring in new players so I am sure it will be a good season."