Hi Interest,
A few years ago but my son and his friends were mainly looking at Westminster/St Pauls/Kings Wimbledon or boarding at 13+ or City/Dulwich/Latymer U and Alleyns at 11+.
My own observation was that those boys who got more than one pretest offer for an 13+ school tended to have their own views. From a parental point of view they are all good schools, and the best school is likely to be the one the boy wants to go to.
The school journey is important. These are all great schools but no boy is going to get the best from any if they are spending long hours on the tube or train.
In DS' year Kings Wimbledon seemed to be the popular choice, with both parents and boys responding to feel of the school. Westminster was a bit marmite. Boys were either enthused by the historic buildings and legacy of 1,000 years of scholarship (that may sound pretentious for those who have not visited, but the school yard is dappled by the shadows of both the Abbey and Parliament) or turned off by the prospect of Saturday school, long commutes and running around central London on the way to classes. Some parents, especially those in the financial sector, were attracted by the scope to switch to boarding should their work take them away from London. I doubt many boys thought much about girls in the sixth form, but it seemed to be a, negative, factor for some parents.
St Pauls has stunning facilities and lots of green. Because of its location, the catchment is more solidly West and South West London, whereas Wimbledon's catchment goes quite far out into Surrey and Westminsters come from all over. There was a perception that the competition between pupils was more overt at SPS, and that it was more of a hot house, which meant none of my son's friends eventually chose to go there. (In fairness the facilities at SPS are so amazing that DS' friends who were interested went to Colet Court at 7+.)
There was a distinct increase in interest in boarding between the ages of 10 and 13 which meant some turned down their day school offers in favour of boarding, whilst Westminster, with scope to spend longer with school friends and less time at home, became more attractive.
It was perfectly possible to get a place at one of the three 13+ schools and be turned down by one of the 11+ plus schools, particularly the co-eds.
As for whether the 2014 results have been issued yet, my understanding was that interviews and offers came in batches. Primary/prep school heads will have been approached for references so may know more.