Can't speak to Gemma, but I found 1.5 superior to Claude and ChatGPT 4 when it came out. The trend seems to be each taking the lead when it comes out, being king of the hill for a couple weeks, and then being surpassed by the next.

Claude's reign has begun, and I'd say it has a solid enough lead for at least another two weeks of dominance before it's dethroned.