iPad with Retina display: 652g; 241.2x185.7x9.4mm; 9.7-inch 264ppi displa;, forward and rear facing cameras; 16GB, 32GB and 64GB internal storage; wi-fi and cellular connectivity. Prices start at $499 for 16GB or $629 for 16GB plus 4G cellular connectivity. Available now.
Google Nexus 10: 603g; 263.9x177.6x8.9mm; 10.055-inch 300ppi display; forward and rear-facing cameras, 16GB and 32GB internal storage; wi-fi only connectivity. Prices start at $399 for 16GB, going up to $349 for the 32GB model. Available from November 13.
The Nexus 10 is cheaper, lighter and offers a higher resolution than the latest iPad plus a USB and a micro HDMI port as standard (the iPad can now connect via lightning port adaptors, each of which is an extra cost.) It is also $100 cheaper. However, the iPad offers cellular connectivity and up to 64GB of internal storage plus a larger selection of apps, plus it's milled from aluminium rather than plastic.
In terms of resolution, screen size and price, the Nexus 10 is a massive threat and the first true competition to Apple's iPad.