"I don't know until they pick their side just who's going to play in that team and where.
"But I know a lot about individuals which I probably wouldn't have the luxury of had I'd been involved in club football.
"I've been able to concentrate on it a lot more, which allows me to put more time in.
"In my five years in the job this will be as best prepared team as I've ever had.''
The focus has been very much on New Zealand since Sonny Bill Williams' decision to play in the tournament.
However, Sheens is very wary of the threat of England on home soil and believes Steve McNamara's side will have the confidence they can win a first World Cup since 1972 thanks to their NRL forwards contingent.
"With a full-time coach they've worked really hard to improve their national side,'' he said.
"Although they may not have the depth of Australia and New Zealand, in '09 and '11 everyone tipped us to play New Zealand in the Four Nations final and they beat the Kiwis.
"Sam (Burgess) hasn't played since 2010 and in `09 he blew us away. Although we won in the end it wasn't until we got away from them in the 60th minute.
"He made his name that day and now he's got his brothers and Graham with him. They've spent money preparing and they'll be confident playing at home.''
"You can't discount England.''
In addition to the traditional powerhouses, Sheens expects a huge impact from nations such as Tonga and Samoa, as well as Fiji - who are also in the Kangaroos' group.
All three sides will have a large NRL contingent in their starting line-ups.
"This will be the strongest contested World Cup,'' he said.
"With the rules relaxed that you can still play State of Origin or for Australia or New Zealand next year it's thrown out about 125 NRL players in the pool and we're only using 24 of those.
"The standard will go up considerably. This series will be very hard to win and so it should be in a World Cup.''
- AAP