I played around with the Plus a bit at Best Buy this afternoon.

Looking at some web sites side by side with my 5S in landscape mode.

Easier to read but given the resolution differences, it doesn't display more text so it wouldn't save much scrolling.

I then looked at the same sites on my iPad Mini Retina.

I'd say the amount of content displayed is closer to the 5S than the iPad Retina Mini, in landscape mode.