Worthwhile lens upgrade?

[onyx39]

Currently have an Eos450d, which I upgraded from a 300d (massive improvement)', bought a used Canon fit 75-300 lens to replace a previous lens, now looking at the shorter focal length.
Is this a worthwhile upgrade from the standard kits lens?
I realise that being a 2.8 aperture as opposed to 4.5, but are there other benefits!

[Golaboots]

That sigma is only f2.8 at the wide end, it's f4.5 at the long end which isn't all that much different to a kit lens.
The canon 18-55 kit lens from that era is usually panned as being the worst of all manufacturers kit lenses so perhaps this sigma will be sharper.

The usual advice is to invest in a 50mm f1.8 as a second lens.
Canon do a nice pancake 40mm f2.8 too.

[robbieduncan]

Buy a current spec IS kit lens on eBay. Or pony up a lot more cash for a Canon EF-s 17-55 f/2.8 IS

[SlidingSideways]

Or the Tamron 17-50 F/2.8 (the non-stabilised version is cheaper and sharper).

[RobDickinson]

That sigma is a pretty decent lens and a worthwhile cheap replacement for the old kit lens.

[mrdemon]

SlidingSideways said:

Or the Tamron 17-50 F/2.8 (the non-stabilised version is cheaper and sharper).

I have one you can have, I mean the op can have for £80. Plus post.
A good lens for sure.