It looks promising, I am looking forward to seeing the real world experiences by users.
Just seen it on pre-order at Warehouse Express for £1099. Ouch. That is more expensive than the Canon 24-70L mk I. From looking at the US price, I was expecting it to be less than the Canon L - B&H have it priced at almost $300 less, so was expecting it to be around the £800 mark.