I use an G5 myself and 10.5.7 and We don't have any issues. My big suggestion is to have plenty of RAM as 10.5 does require more RAM usage. I create postscript files using OSX out of Quark without any problems. I would believe 10.5 would run better in intel based G5 although mine is PPC but I added plenty of RAM and it does good.
my .02
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