How much steeper? Well, according to the published formula, your site would need:
* 101 PR4 backlinks to reach PR5
* 555 PR4 backlinks for PR6
* 3,055 PR4 backlinks for PR7
* 16,803 PR4 backlinks for PR8
And only:
* 1 PR7 backlinks to reach PR5
* 3.5 PR7 backlinks for PR6
* 18.5 PR7 backlinks for PR7
* 101 PR7 backlinks for PR8
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A friend sent this to me not long ago, I think he got it from seochat.com
Thought it would be useful for you guys here.