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HP makes the "DreamColor" laptop
Lenovo has the W530
Dell has the Precision series
These all have full gamut screens (or at least 95%) with the "DreamColor" being around 120%. I've used both the Lenovo W520 and Dell Precision laptops, but not the HP. My preference for the monitor between the Dell vs. the Lenovo is for the Dell Precision.
Sager also has a full gamut option now, but I've no experience there either.
I've tried to find info on Sony's gamut but never did get solid info on their offerings. Their CS & website info was abysmal with people not even knowing what gamut is, but given Sony's involvement in the industry I'm hopeful that they might have a wide gamut option (I haven't checked for a while at their display offerings) as well. But, Sony doesn't seem too progressive at making machines with large RAM capabilities like the HP, Dell, Lenovo & Sager and multiple drive options ... i.e. very consumer oriented rather than scalable performance oriented.
The HP, Dell and Lenovo's best in class machines are not some cute little sleek super thin lightweight ultraportable notebook. They are performance machines (which generates heat, which requires cooling, which makes things bigger, i.e. heat sinks/fans, etc.). I mention this in case you are hoping to find performance and small size and great display. The best displays are only found on the best performers ... as far as I've been able to find.