I have gone through all the related questions regarding my case on the website. I still feel that I could post my question because it is different from the others. Please share your thoughts. Thanks.
a. F1 brings both the IP and Idea that is instrumental to develop the product which company plans to sell.
b. F1 and F2 equally share responsibilities to develop the business model, approaching investors, potential customers, identifying target markets, etc. (all related to business)
c. F2 has more professional experience (non-critical to the startup) than F1.
d. F2 joined F1 who has already left his job and has been working towards starting a company.
What's a fair F1:F2 equity share?
Edit: Thanks for your suggestions. But, let me put it this way. The company is a product development company in a niche technology, untapped market. F1 has worked and studied in the same over the past few years and developed IP in it alongside with patents related to the same. Does the share still remain the same?