I don't have any side-by-side comparisons at this moment. There are some differences as they used an updated version of cycles for Poser 12. They added a few nodes. The sensitivity of the roughness of the various glossy nodes is different so some shaders may look too shiny. The shadow catcher now sort of works. It can be used with a background, but not with a skydome. The speed has improved and they've added adaptive sampling and a denoiser which can both help reduce time more.

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Available on Amazon for the Kindle E-Reader Monster of the North and The Shimmering Mage

Today I break my own personal record for the number of days for being alive.
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I use Poser 13 and win 10