on the macbooks, samsung's screens are better quality than the LG ones. with people swapping them until they get a samsung screen. cant believe this makes you happy. quite sad really
This is not entirely true. It all depends on the screen size and MacBook model. For the MacBook Air 13", at least for the 2011 models I found the LG panels to be superior in terms of viewing angles and raw calibration. The gamma profile and colours were better with the LG panel.
With the 11" model it all seemed to be the other way around, but when it comes to LCD panels you can't really compare between sizes as the Samsung 11" panel is vastly different from the 13" ones, same goes for the LG panels. If someone measures the LG panel of the 11" to be inferior to the Samsung panels you would be foolish to think this counts for the 13", Pro 13" and Pro 15" as well.
When I had my MacBook Pro 17" 2010 model (Samsung) and MacBook Pro 17" 2011 model (LG) side-by-side there was no doubt about the LG one being superior to the Samsung one. Samsung has this bad habit of over-saturated colours making for horrid gamma profiles and calibrations way out of any kind of natural charts. It might look good for some, but it's not remotely close to being realistic.
To be honest Samsung doesn't go all out on the colour saturation on the panels used on Apple notebooks and this is most likely due to Apple's very strict quality control and demands from their suppliers but my experience from MacBook Air 13" and MacBook Pro 17 the last years the LG panels have mostly been superior if you are looking for the best calibrated panels out of the lot.
The iMac 27" doesn't feature Samsung panels at all, and the 2012 models are one of the best "out-of-box" calibrated monitors for it's price range currently on the market. I don't know about the 21,5" one, but considering it's now all IPS and Samsung tends to not do IPS I guess they aren't involved in those either and they've had some pretty decent reviews as well.
Not the mention the Retina models, all being non-Samsung IPS panels and they are looking great with really good out-of-the-box calibration and gamma profile for notebooks.
If you take a look at computer monitors as a whole, Samsung doesn't really offer much in the high-end calibrated market at all. They mostly have some decent PVA panels, and some horrid TN-panels with colours way out of the chart and that's mostly it. You would normally be looking at Eizo, NEC or Dell if you wanted some decent calibrated ones and possibly Asus's Pro line if you aren't willing to pay the premium for the other brands.
Hell, take a look at Samsung's own line of premium notebooks and tablets and you see next to none capable of being close to anything premium in terms of colour calibration and gamma profile out-of-the-box. They are beaten by Asus on quite a few notebooks and their Inifity tablet beats all current Samsung ones.
And you have a pretty good example with this whole Samsung does their own PLS thing instead of IPS. PLS is basically Samsung own proprietary answer to IPS and they are both pretty much the same thing, rocking the same good viewing angels and whatnot but whereas we have many decent calibrated IPS monitors, all PLS monitors comes oversaturated out-of-the-box.
Same goes for Samsung televisions, they all feature horrible colour profiles out-of-the-box pushing contrast way off the chart. They look awesome once you've gone through some serious calibration, but lets face it barley anyone actually calibrate their display in any sensible way resulting in you being better of with a high quality Panasonic Plasma or something other than a Samsung LED-LCD television in terms of colour reproduction.
All in all, I can't see the sad part in Samsung being left out in the dust in terms of display panels. When it comes to SSD's though I certainly hope Apple don't drop the ball on Samsung until they have either Intel or Micron on the team. Going all Toshiba SSD would be downright silly in terms of both performance and stability.