Apple has updated its Retina MacBook Pro, making it even thinner and lighter than its predecessor, and adding new Haswell processors to both the 13in and 15in models.

The Retina MacBook Pro models got a significant update during Apple's 22 October event, and will begin shipping today with OS X Mavericks.

There are some differences between the two models, so we'll start with the 13in Retina MacBook Pro

New 13in Retina MacBook Pro: design

The 13in Retina MacBook Pro is lighter than its predecessor, weighing 1.57kg. It's also thinner, at just 1.8cm tall.

New 13in Retina MacBook Pro: processor

The 13in Retina MacBook Pro has Intel's new Haswell chips. It's available in three configurations (with additional custom options too).

The first has a 2.4GHz dual-core Intel Core i5 processor with Turbo Boost up to 2.9GHz and 3MB shared L3 cache. It also has 4GB of 1600MHz DDR3L onboard memory and 128GB storage space.

The second also has a 2.4GHz dual-core Intel Core i5 processor, but has 8GB of 1600MHz DDR3L onboard memory and 256GB of storage.

The third has a 2.6GHx dual-core Intel Core i5 processor with Turbo Boost up to 3.1GHz and 3MB shared cache, with an 8GB 1600MHz DDR3L onboard memory and 512GB storage space configurable to 1TB.

New 13in Retina MacBook Pro: graphics

As for graphics, the 13in Retina MacBook Pro includes an Intel Iris Graphics. This means the integrated graphics are up to 90 per cent faster than the previous generation, according to Apple.

New 13in Retina MacBook Pro: battery life

The battery life has been improved too. It can now last for up to nine hours, according to Apple, which is two more hours than the previous generation.

New 13in Retina MacBook Pro: other features

The new 13in Retina MacBook Pro has PCIe-based flash storage, which means up to 60 per cent faster read speeds than the previous generation, Apple says.

When it comes to WiFi, the 13in Retina MacBook Pro has 802.11ac WiFi that's up to three times faster if you've got an 802.11ac base station connected.

There are two Thunderbolt 2 ports in the 13in Retina MacBook Pro, too.

New 13in Retina MacBook Pro: release date

Apple will begin shipping the 13in Retina MacBook Pro with OS X Mavericks today.

New 15in Retina MacBook Pro: design

The 15in Retina MacBook Pro is just 1.8cm tall, and weighs 2.02kg. Other than the slight height and weight change, though, the design of the 15in Retina MacBook Pro remains the same as its predecessor. 

New 15in Retina MacBook Pro: processor

The new 15in Retina MacBook Pro has Intel's quad-core Crystalwell chip. It's available in two customisable configurations.

The first has a 2.0GHz quad-core Intel Core i7 processor, with Turbo Boost up to 3.2GHz and 6MB shared L3 cache with 8GB of 1600MHz DDR3L onboard memory and 256GB of storage.

The second has a 2.3GHz quad-core Intel Core i7 processor with Turbo Boost up to 3.5GHz and 6MB shared L3 cache with 16GB of 1600MHz DDR3L onboard memory and 512GB of storage.

New 15in Retina MacBook Pro: graphics

It also uses Iris Pro graphics - integrated graphics that deliver the same performance as discrete graphics. If you go for the higher-end model, you'll get NVIDIA GeForce GT 750M with 2GB of GDDR5 memory and automatic graphics switching.

New 15in Retina MacBook Pro: battery life

Apple says that the 15in Retina MacBook Pro has up to 8 hours battery life, which is one hour more than the previous generation. 

New 15in Retina MacBook Pro: other features

The new 15in Retina MacBook Pro has PCIe-based flash storage, which means up to 60 per cent faster read speeds than the previous generation, Apple says.

When it comes to WiFi, the 15in Retina MacBook Pro has 802.11ac WiFi that's up to three times faster if you've got an 802.11ac base station connected.

There are two Thunderbolt 2 ports in the 15in Retina MacBook Pro, too.

New 15in Retina MacBook Pro: release date

Like the smaller model, the 15in Retina MacBook Pro will begin shipping today with OS X Mavericks.

New Retina MacBook Pro: UK price

The new Retina MacBook Pro models are available from a lower price of £1,099.

For the basic 13in model it'll cost you £1,099. For the mid-level 13in model you'll pay £1,249 and for the high-end 13in model it'll cost you £1,499.

The 15in model costs from £1,699, with the high-end model at £2,199.

The non-Retina MacBook Pro is still available to buy, but there is now only one configuration available: 13in, 2.5GHz dual-core Intel Core i5 with 4GB memory and Intel HD Graphics 4000. It'll cost you £999.

If you want to find out what we expected from Apple prior to the event, you can read the next page for our rumours article.