I help out with reading in reception and none of them are on these high levels, because they seem to do it a little differently.
I think it is because they really really stress the phonics, so they send home phonics books and phonics flashcards and tricky word sheets etc etc.
We didn't even get reading books until Christmas and dd knew all her basic phonics before she started school.
She is in the top set and going along in leaps and bounds etc, but she isn't on a high level ORT book. Instead they have jolly phonics books which are very weird stories with all the words based on the phonics they know. They seem hard to me, because of the strange words, but she can read them. I think she could read ORT level 5 or 6.
I think the schools approach is to stress the basics, rather than stress the books. Not sure if this is a good thing or not, it is different to how ds and dd1 learned, so I am watching with interest. But it is certainly feeding into their writing and spelling, and when they come across these difficult words, they can decode them very confidently.
I think it is impossible to compare over the internet, because schools use of language varies. I have seen so many people say their child is ''off the top of the school reading scheme'' or a ''free reader'' when they are in reception. In our school, that is a level reached at year 3/4 or above. A child off the top of the scheme is one who is at Harry Potter reading level. In another school, it may mean they can read ORT level 12. That is 2 very different levels, and without knowing the schools definition, I think it is hard to compare.
FWIW, I have helped in a couple of schools and I think that mn kids are obviously all in the top 25% of reception classes.....