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to me, redwood sounds like taking the warmth of cedar & the 'snap' of sitka spruce, but like ovangkol, with it's
'mahogany-like mids & 'rosewood-like lows', it (redwood) takes a little from both (sitka & cedar) without sounding
like either in that it still has a very unique tone & response, sort of like a cedar top that can be strummed as aggressively
if not more so, than sitka (great 'headroom'), while retaining warmth, clarity & definition with a 'darker' overall voice
sinker redwood with its mineral deposits may have an audible difference in tone, due to variances in density
Yep, exactly what Michael said.
I would only add that like any top wood, the stiffness can vary, and that will effect tone. More flexible redwood tops will sound more like cedar and stiffer ones will sound more like sitka spruce.
Personally, I think it is the most versatile top wood. My redwood-top guitar responds rapidly and with volume with light finger picking or strumming, and will sound louder than spruce. But I can also drive it hard with a flat pick like a spruce top.