Please don't compare between schools.
My DSs started school in different primaries (we moved) and the schools were/are very different in their use of reading schemes. DS1's school used a range of schemes banded according to something called Cliff Moon. By this stage in Reception he was reading books in a band that included ORT 3 (I remember him reading a particular book on holiday on DH's birthday); they were very easy for him. He was in the top reading group and there were 2 boys who were on the next band up. No one was 'off the reading scheme' by the end of Y1, even the children who were reading Roald Dahl etc at home.
In their current school, where DS2 started, they pretty much only use ORT in Reception and by this stage of Reception the whole top group was reading Stages 6-8 ORT or above. The top group was all 'off the reading scheme' by Christmas in Y1.
Yet I know for a fact percentage-wise each year School 1 gets more Level 3 readers in KS1 than School 2.
So I've concluded - big surprise! - that it really doesn't matter and YOU CAN'T COMPARE! Honestly, if I'd visited Mumsnet when DS1 was in Reception, I'd have panicked.