Big difference between Retina and non-Retina MacBooks on ACD?

I'm deciding between a 13" MacBook pro/retina and a 13" MacBook Air. It'll mostly be used with my 24-inch, Late 2008 (1920 x 1200) Apple Cinema display. Will I see a big difference in text clarity with the Retina Pro instead of an Air plugged into it? Thanks for any advice.

Thank you very much for the reply Geoff93......but I'm still baffled.
If what you say is so......Is BT not my ISP ?? ......(and therefore "bypassing their own congestion" to achieve better figures) ?     How come other users show speedtest.net download figures of 30+ Mbs when I struggle to get more than 10 ?  and still doesn't explain why my download speed is nearly always less than upload speed ?
The Openreach engineer said that according to his meter on installation I had a possible 37+ Mb down and almost 10 up....but in practice he was only getting Speedtest.net readings of around 4.5 Mbs to 11 Mbs using both wireless and/or ethernet cable and using three different computers  (with three different versions of Windows) to cross check. 
I had hoped (and expected from the option 2 + Anytime calls Infinity monthly agreement taken on !) that the speed of operation would have been quite noticeably faster than the old 1 Mb down / .5 Mb upload copper cable connection but it has not .....and is less reliable having dropped connection regularly last week. 

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    Regards
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    http://help.sap.com/saphelp_nw2004s/helpdata/en/80/1a62f8e07211d2acb80000e829fbfe/frameset.htm
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    http://help.sap.com/saphelp_nw04/helpdata/en/82/f2dc37f0f12313e10000009b38f8cf/content.html
    http://help.sap.com/saphelp_bw31/helpdata/en/82/f2dc37f0f12313e10000009b38f8cf/content.html
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