What is difference between Sony a7 and a7r?

Related questions

1. Is Sony cameras good?
2. Which is best Canon Nikon or Sony camera?
3. What does the R stand for in Sony a7r?
4. Is Sony E mount full frame?
5. Are Sony lenses cheaper than Canon?
6. Is Sony a7 a good camera?
7. Is Sony a mount full frame?
8. Are DSLRs become obsolete?
9. What is the S in a7s?
10. Which is more expensive Canon or Nikon?

Tags

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2. #megapixels
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4. #gives
5. #cameras
6. #sharper
7. #difference
8. #number
9. #images
10. #plenty
11. #aliasing
12. #resolving
13. #which
14. #detail
15. #filter
16. #pixels
17. #about
18. #sensor