The highest display resolution of the Sigma 29 is HD-Ready. That's 56% less display resolution than the most common HD type of Full HD. HD-ready TVs have a resolution of 1280 x 720 pixels.
An HD-Ready HD type is in fact the worst display resolution across all TVs of a similar age and spec to the Sigma 29.
A Full HD HD type is the best display resolution across similar types of TV.
There are a number of alternative HD-ready televisions currently available that you might want to consider including the Cello C20230 (£95.99) which has a better Rating.
TVs with a higher display resolution that might also be worth considering include the Reflexion LDD2471 (£245.85) (Full HD).