I completely share the same feeling. I also had an iPhone 4 when it first came out. Love the retinal display. Have been using it more than anything else. The only draw back for an iPhone is the size if the screen. When iPad 2 came out it was disappointed that it didn't come out with retinal display. So, I decided to wait. Then came Kindle fire. I got it the first day that it was launched, but returned it within a couple hours because of the display as well as user interface.
I got my new iPad ordered right after it became available. Very satisfied with the quality of the retinal display. I use my new iPod primarily for web browsing and reading books. As I am very new at woodworking, new iPad made my research on woodworking very enjoyable. Some of the woodworking books that I purchased for Amazon Kindle, e.g. Hand plane book by Garrett Hack, Router book by Pat Warner, can be read very clearly on new iPad. Pictures are very clear, just like reading a real printed copy. Apple user interfaces, especially pinching, swiping, etc. make reading very enjoyable.
I am looking forward to seeing more e-books on woodworking in the very near future. Hopefully, the price of each book will be coming down and make it more affordable to more people (similar to music purchase on iTunes), so more people can enjoy reading.