I have several of the current Sony Z's and in terms of the screen, I find them generally excellent - glare is relatively manageable since it's not glass-fronted, blacks are very black, colours are vivid, resolution is high for a 13-inch - 1600 x 900 default, higher-end models feature full HD - if apparently not particularly accurate, but I'm not looking for that in a machine like this.
I think it's a good balance of performance, portability and runtime (some reviews peg it very low, and I honestly wonder if these reviewers actually have any clue about looking for the power management features) - certainly one of the better compromises on the market, perhaps the best.
My maximum weight for an everyday-portable notebook is 2Kgs/4.4lbs, and as such I don't consider the Envy 14, which I bought to use as a streaming music client at home, everyday-portable - and I can't comment on the radiance screen as we apparently don't get it here despite it being listed on the brochure as an option.
By my own yardstick the Lenovo X201T (the Tablet) isn't light at just a hair under 2Kgs with the sticky-out battery, but it does have what appears to have a PVA or MVA panel - one of the very few on any notebook - which affords high-quality-desktop-display viewing angles, with the matte finish allowing use in all types of light. Image quality is also good. I'm using these over the Z at the moment since I'm trying to see how tablets can fit into my daily life and I certainly can't fault the screen, provided the standard-for-a-13-inch resolution doesn't limit you. I can, however, fault the design - which is kinda hideous.