In the context of piracy sites, "extra quality" generally refers to specific high-bitrate encodings or high-resolution releases that aim to replicate a theater or physical disc experience:

In the vast, chaotic ecosystem of online piracy, few names have commanded as much attention over the last half-decade as MKVCinemas . For millions of users across India and Southeast Asia, the phrase "MKVCinemas" became synonymous with a specific promise: Hollywood, Bollywood, and regional cinema, all wrapped in a small file size but retaining what the community calls "extra quality."

Stay safe, stream legally, and keep your antivirus quiet.

Stop searching for the (the website name) and start searching for the attributes (the file specs).