Something I've picked up from native speakers is that they tend to say:

Is é an leabhar aige é = It's his book

rather than:

Is é a leabhar é = It's his book

However I've never seen this directly stated somewhere, so it could just be something I have wrong, anybody have any thoughts?

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The dialect I use is Cork Irish.
Ar sgáth a chéile a mhairid na daoine, lag agus láidir, uasal is íseal

Maybe it's a Munster thing?
In Donegal I think people would rather say "a leabharsan 'tá ann" or "a leabhar féin 'tá ann".

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Is fearr Gaeilg na Gaeltaċta ná Gaeilg ar biṫ eile
Agus is í Gaeilg Ġaoṫ Doḃair is binne

I'd view it more of an emphasis thing that's merely more likely to crop up in speech (for that reason). I've heard it before myself but never gave it much thought.

I don't think I've ever heard that. Like Lughaidh said it's probably a Munster thing.

I would say -
Is leisean an leabhar. It is his book.

Thanks guys. I was inaccurate in the English translation in my first post, Munster speakers would also use:
Is leisean an leabhar = He owns the book.

"Is é an leabhar aige é" is more like "It's the book he has", would that be used in the other dialects? An example would be:

Sin é an chéad abairt aige é = That's the first chance he has had to speak.

Is this sentence typical sounding to any of you?

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The dialect I use is Cork Irish.
Ar sgáth a chéile a mhairid na daoine, lag agus láidir, uasal is íseal

Ahhh - That would be correct alright. Especially if you add "atá" or "a bhí".

"Sé an leabhar atá aige é"

"B'é an chéad abairt abhí aige é"
"B'é an chéad abairt aige é"

I think in Munster they must just drop the atá or a bhí in these cases. Thanks again.

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The dialect I use is Cork Irish.
Ar sgáth a chéile a mhairid na daoine, lag agus láidir, uasal is íseal