Google is doing a series on "micro-moments" in the buying decision including the "research on mobile, buy on desktop" pattern.
https://www.thinkwithgoogle.com/articles/micro-moments-travel-customer-journey.html
One of their volunteer study subjects and determined he looked at 1400 images and did 534 Google searches before making a decision.
https://www.thinkwithgoogle.com/articles/get-away-moments-travel-marketing.html
I haven't had a chance to read this yet but...
https://think.storage.googleapis.com/images/micromoments-guide-to-winning-shift-to-mobile-download.pdf