Haven't seen a screen above 1.0 gain that doesn't sparkle to a certain degree. The higher the gain, the more it sparkles. My penthouse neighbor had a dalite high power (2.8) screen a few years ago. It looked great for its intended ambient light fighting use, but it was a sparkling beast.
By the way, not everybody hates a sparkling screen, some people love the look. In my case, I'm aware that my screen (1.5 gain published, 1.1-1.3 real world) sparkles a bit, but it's never distracted me from the content I'm viewing nor has it been a problem with anyone else. The Elite Starbright 7 is the only screen I've seen that sparkled to an objectionable degree for me.
How much sparkles are noticed and objected to varies from person to person. Some people can have a sparklefest screen like a Black Diamond and not be annoyed in the slightest, while others will notice even the slightest bit of sparkle and be annoyed to no end.