After the first weekend of Six Nations action England were already firmly in the driving seat, having dispatched Scotland. Wales, by contrast, were in the doldrums after a disappointing home defeat to Ireland.
Since then, however, things have changed. For England, performance levels have gradually been slipping and culminated in a disappointing, albeit winning, outing against Italy last weekend. Granted, against Ireland in Dublin the conditions were so atrocious it is a wonder that a single pass was completed, but since then they have had reasonably good conditions and have still failed to look threatening in attack.
They have two tries in three games, after putting four past Scotland in the opening round. That is not the progression England fans would have hoped for. Should they fail to cross again on Saturday, and still end up top of the Six Nations log, it would mean the winners of the competition had failed to score a try in more games than they succeeded to do so. That is not a stat Northern Hemisphere rugby should be proud of.
There are doubts about plenty of England's players where previously there weren't any. Chris Ashton is a shadow of his former self. Danny Care, virtually with one kick, has played himself out of a starting spot for the near future. Dylan Hartley has been overtaken by the vastly less-experienced Tom Youngs. These players will come good again, but for now it is worrying.
Wales on the other hand, while not exactly setting the world alight either, are at least trickling through tries and seem to be moving in the right direction. They have the most in the tournament - seven in four matches, which frankly speaks volumes of the paucity of attacking rugby on offer over the past few weeks. They are, however, looking like a confident team who believe they can win.
Contrast that to the beaten-down outfit who ended the Autumn Internationals and you have significant signs of improvement. Their most important players - the likes of Sam Warburton and Alun-Wyn Jones - are getting back to their best form and with them the whole team seems to have been boosted.
So the sheen has been somewhat wiped away from Lancaster's England revival. They are by no means a bad team, but do not look like the one that so convincingly stuck it to the world's best in the autumn. A performance similar to that one will be necessary to overcome a resurgent Welsh outfit in Cardiff.
On top of all of this there is the fact that nothing - and that is not hyperbole - would give the Welsh more pleasure than denying England a Grand Slam and grabbing the Championship and Triple Crown from their grasp in the process. They will not be lacking for motivation.
For England, that will come from the fear of ending a Championship with nothing that at one point they threatened to run away with. Two great rugby nations with a great rugby rivalry are set to go head to head. Game on.