While smartphones are judged on their ever more finely graded pixel density, we seem to have let TVs off the hook in recent years – but that stops right here.

The new fashion for Ultra HD 4k TVs is embryonic, but long overdue; Full HD TVs' paltry two-megapixel images are ripe for an upgrade.

Bargain examples of the new screens are few and far between so far, but the cream of the crop – Sony's KD-55X9005 – is now being sold by Amazon for a great value £2,654.39. It may not be a cheap TV in the strictest sense, but that's down from a list price of £3,299, which represents a hefty saving.

The 55-inch Ultra HD 4k TV, which is based around an edge-lit LED-backlit LCD panel, boasts an unusual design that sees speakers on each side, and received a five-star review from us last year.

If those Magnetic Fluid speakers are a nice addition and help create an instant home cinema style, it's the luscious detail adorning the so-called Triluminos display that makes the KD-55X9005 truly something special. Complete with 4k X-Reality PRO upscaling of all sources to 4k, it's a reminder that at 8.3 megapixels, Ultra HD 4k is a big jump.

Prospective owners of the new 4k-filming Sony Xperia Z2 smartphone, take note.

Cheap TV deals of the month

Cello C22EFFtraveller 22-inch LED TV with Freeview and built-in DVD player | Was: £197.97 | Now: £179.98 | Appliances Direct

Sharp LC-24LE250K-WH 24-inch HD-ready LED TV with Freeview and white bezel | Was: £179 | Now: £139 | ASDA

Finlux 40F8073-T 40-inch Full HD LED TV with smart TV | Was: £399.99 | Now: £319.99 | Finlux Direct

Toshiba 40L6353 40-inch Full HD LED TV with Smart TV | Was: £399.95 | Now: £349.95 | Richer Sounds

Samsung UE42F5000 40-inch Full HD LED TV with smart TV | Was: £526.99 | Now: £379.96 | Amazon

Samsung PS43F4500 43-inch HD-ready plasma TV with Freeview | Was: £424.99 | Now: £289.98 | Amazon

Samsung UE55F6500 55-inch Full HD 3D LED TV with Smart TV, Freeview HD & Freesat HD | Was: £1,099.95 | Now: £999.95 | RicherSounds

Samsung PS60F5500 60-inch Full HD plasma TV with smart TV & Freeview HD | Was: £994.99 | Now: £949.00 | Argos

Panasonic TX-P60ZT65B 60-inch Full HD plasma TV with smart TV, Freeview HD & Freesat HD | Was: £2,999.95 | Now: £2,599.95 | Richer Sounds