Of the two - the Sony, Reason:
.. Ram, Looks the same, but the leveno does not specify if ram is 1x4 or 2 x 2 (probably the 2 x 2). The sony is 1 x 4 which means you can go to 8 gig by buying just 1 4gig module (need to match the specs of the one installed.
.. iGPU, since neither have a dGPU HD4400 > HD4000
.. Screen - Sony way better @ 1920 x 1080 (2,073,600 pixels) vs 1600 x 900 1,440,000 pixels). This means that the sony has almost 50% greater pixel density Biggy (smaller but clearer text, higher resolution for graphics
.. 2 x USB3 vs 1 x USB3 + 1 USB2
Wieght, Sony almost a pound lighter.
.. Neg for sony - SSD is only half the size. But generally a 128 is OK for a OS + Program drive. On all My systems win7 + programs take about 35 Gigs. That would still leave about 60 gigs for your files/data. This can be agumented with a 64 gig USB3 thumbdrive.
.. Only 4 core/4 thread vs 4 core/ 8 threads, Already explained - may, or ma not be a true negative depending on usage.
Added: On screen resolution.
.. The sony screen is a much better/more expensive screen.
.. Little more on resolution:
--- Leveno: PPI = 138.03 / Dot pitch = 0.184
--- Sony : PPI = 165.63 / Dot pitch = 0.153
---- Ref for PixelsPerInch: http
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