DISCLAIMER: I've had 60 mins with the Z4, not enough for full tweak settings. Also at the moment I'm only interested in HDMI from a HTPC. So I've had the Z3 for a year, got it exactly where I want it - filtered & tweaked CC30R and all, so what do I do ... Sell it for £650 thinking getting a Z4 would be a natural improvement for not a massive amount of dosh. So let's get it out of the way and this is based on the 60 mins I have spent with the Z4. How much better is it than the Z3? Well I want my Z3 back ... It's not so much a case of the Z4 being worse more a case of Z3 being good enough, and some of the changes to the Z4 being disappointing. okay the good: The lens lock is nice, as is the automated slidy draw. VB is also banished. (though it was as good as gone on the 3) shadow detail seems good, while outright black level looks the same as the Z3 - unless in auto lamp mode where it can squeeze a good black level but see below for the problems with that. greyscale tracking out of the box looks better than the 3 but well within the grasp of the Z3 after tweaking. the bad: The Auto lamp iris, awful, awful ... there is a delay of about 2-3 secs on this thing - you can see it swing during dark scenes mostly. Admitatedly if you run in the creative cinema preset it's not as bad but being a Z3 tweaker I wanted to explore the Powerful and Vivid modes that had yielded good contrasts on the Z3 and take the benefits of the lamp iris. Well forget it, yes the Z4 can produce a better black level with the lamp iris - for instance dig up a black bars in AVIA and switch from the the black-bars to blackbars with 50% grey for an exagerated example. It's not this bad in films but it's still a complete distraction - this is my first experience of this - if all the singing and dancing over the HS50 was justified and the Iris was transparent in operation I would like to see it. HDMI - seems to have got worse in a strange way, with the Z3 set up your 720p DVI out connection reduce overscan to 0 and away you go. On the Z4 there is a odd representation of 1-1 pixel mapping. It seems to carry edge enhancement, a bit like mosquito noise but on your windows desktop. I've tried reducing sharpness and it does help but it's not a patch on the 3. Very disappointing, though at least it doesn't lock up. Fan Noise is about the same or maybe a little less. The remote control is crap. They've cheapened it, made it smaller and less well laid out. This may seem insignificant but when you are tooling around with these things for hours at a time, it really helps to have a nice big clean lay out with separate user mode buttons: not so this time we have one user mode button that cycle's through. Spacing between the buttons is tight. The menu system is also quite messy, the Z3s though far from perfect had a decent logic to it. Though you obviously get used to things like this. So a bit of a let down. Coming to the machine for the first time, it would be great - but it just feels like a rushed implementation of a needless featureset - the Z3 is a solid model and I suppose you can turn off the lens iris but in that case, well I guess I should have just saved the cash. Anyway, more to come I'm sure as well as a proper tweak thread and measurements over the next few days.