Darren,
It's got plenty of power at 28hp, but for heavier logs it might not have enough weight even with Wheel weights, Filled tires, and ballast in the FEL.
That's easily cured by chopping the log shorter though.
Masseys aren't too common around here, but the 1428/1528 is in the same class as the other(JD 20's etc) CUT's, and the guys running them as Light GP Tractors don't have issues with skidding a log now and then.
Good advice on the tires by eric... Those turf tires are worthless on anything but Pavement, go with the AG tires and have them filled with "Rimsaver" for ballast. Skip the Chloride, the stuff is nasty and eats rims.
Keep shopping around and make the dealer sweat!
McCormic is also running some really killer deals right now.
Good luck to ya!
Dingeryote