Yes Craig, thats the point..
Something else to consider also is screen size ... my screen is a 143" scope( 150" 16:9) ..that is the maximum size i would be comfortable using with the Z1.
Eventually in the not to distant future i want to run a 170" 16:9..... My Z1 has got "Buckley's" of effectively lighting this up.
When i auditioned the Sony 5000ES on 180" screen, i came home and my screen looked positively "Tiny"!!
At this moment there are very few options IF you want to run a larger sized screen.
The other thing with larger screens is "Sharpness" becomes even more obvious and important .
On small screens ..110-120" ALL projectors tend to look more or less equally "Sharp" ...as the screen size increases you really DO notice some rather prominent differences sharpness wise in the different projectors.
Take my X9900 for example.....project a small 110-120" screen...it looks quite sharp and respectable .... even in relation to my Z1.
Project onto my 143" Scope ( 150" 16:9 ) and the difference is huge! .
Take the LK970 , using it on a small 110-120" screen would be an utter waste....too bright, and it cant stretch its legs with is brilliant sharpness. On my screen size it pulls ahead of my Z1 substantially ( sharpness wise) .
I imagine on a 170"+ screen the difference between my Z1 and the LK970 would be even more apparent.
The Sony 5000ES is another projector that i respect....on a small screen below 140" i prefer my Z1, BUT any larger i would take the the 5000ES ( even with its noticeable contrast loss) over my Z1.
The LK970 while NOT having anywhere near the contrast of the 5000ES , does provide a similar light output at a fraction of the price of the 5000ES, so it makes lighting up a Large screen a 'Reality" instead of a "Fantasy" for a lot of people.
From what i have seen of the 5000ES , the LK970 is Noticeably sharper ( just like in the case of the LK970 vs my Z1 ) .
So yes, "horses for courses" !