Once again, Sony has no laptop of similar combination of size and power to compete with the Vaio SB except one - the Sony Vaio Z. And the better Vaio SA's specs is still unknown.
source:
http://www.gadgetfreak.gr/?p=28069
Link:
http://www.sony.co.uk/product/vn-s-series
Vaio SB specs
Screen size: 13.3"
ODD: DVD combo or Blu-ray burner
Processor: Up to Core i7 Sandybridge 2.7 GHz
Graphics: Up to AMD Radeon HD 6630M + Intel® HD Graphics switchable
Storage: Up to 750 GB HDD or up to 256 GB SSD
Dimensions: 13.03" x 8.84" x 0.94"(full flat)
Weight: 3.86 lbs
Battary: Up to 7 hours (up to 14 hours with optional slim extended battery)
(Vaio SA specs yet to be official - likely better specs with same form factor)
MacBook Pro Specs
Screen size: 13.3"
ODD: DVD combo
Processor: Up to Core i7 Sandybridge 2.7 GHz
Graphics: Intel® HD Graphics
Storage: Up to 750 GB HDD or up to 512 GB SSD
Dimensions: 12.78" x 8.94" x 0.95"(full flat)
Weight: 4.5 lbs
Battary: Up to 7 hours