I, on balance think that it's quite advanced. My dd was like this, started talking pre 1, when she started walking. Could point to parts of her body before she could talk/knew animal noises etc. Had god knows how many words by 14 months (who on earth counts? do they write each new word down in a special diary ). However she was my pfb so I had nothing to compare to.
My ds1 didn't really say much pre 2, only really started talking aged 2.5, but now at 3.7 is going great guns and has lots of imagination and long sentences.
There's obviously a wide range of normal, to me dd was perfectly normal (I didn't do baby groups). In fact when I had pnd after ds1 was born and the hv came round I was very puzzled that she spent the whole time going on about dd and how clever she was . I was like, erm yes she's clever, what about my crushing depression . I think one lovely thing she came out with was that I had to exersize my children each day (a walk) or their brains would not develop correctly . She was such a help I tell you .
God knows about ds2, he's only 6months but he seems very alert etc is doing the whole baba mama dada thing.
I think it doesn't really matter, unless there is a problem they will get there in the end. Early milestones may be a sign that they will be clever, or they may level out.
But really are you going to love them any less because they talk late or have a problem, erm no. It's all pointless competion.
Dd is very clever, taught herself to read, is flying ahead in school. Does it mean she will live a charmed and happy life? No, it's one facet of a childs whole personality, its no more important than any other facet, imo.