Very much depends upon the kind of sailing you are doing and remember, there are many other factors to consider when it comes to weight.
We recently took my E28 on a five day cruise with four adults, a full diesel tank, 40 liters of spare diesel, 15 liters of petrol for the outboard, food and booze (inc 5 cases of beer, a full cool box and a full Eski), two anchors totaling 22.5 KG, plus 60 ft of chain, full water tank (plus my extra water tank - around 60 gallons in total) plus an extra 20 liters of frozen water in bottles.
With some careful thought about weight distribution all fitted in nicely and all bunks were usable (if you don't mind cuddling up to the spinnaker, boat hook, charts, bags etc
).
Did the boat feel cramped and heavy? A little bit but at no point did it ever feel unsafe, she's a sturdy boat and more than took it all in her stride. No-one complained, the attitude was great and we had a blast, performance was fine - 7.5 kts on a nice run in 15-20 knts of wind.
I think you're fine with 4-5 adults.
Hope this helps.