so i take many indoor staged events (ie. piano recitals, dance performances, etc). i currently have have the 2.8 non-IS. im debating should i sell that and get the IS with a price difference of 600-800 dollars or just buy a 135 2.0L for around 900? will the IS make up for that speed? i really like having the versatality of the zoom. i hear it is just as good as most primes. i already feel that with my non-IS, its tack sharp and razor fast, but im wondering if that IS will give me the edge...your opinions please.




