Last year, we commissioned an independent 3rd-party vendor to prepare a whitepaper comparing GCP pricing with AWS: https://cloud.google.com/files/esg-whitepaper.pdf

We also have a handy guide for AWS professionals who are looking at Google's cloud: https://cloud.google.com/docs/google-cloud-platform-for-aws-...

[Disclosure, I work for GCP, but I love all TLAs equally]

There are some half-truths in that whitepaper, like "reserved instances cannot be resized" (They can, within the same "class" of instances)

there are a few resources out there, the most recent one: http://www.zdnet.com/article/what-google-says-to-aws-price-c...

But GCP also has a pretty nice pricing calculator: https://cloud.google.com/pricing/tco/

Cheers,