Similar.
I recommended my friend buy the Musical Fidelity B1 amp all those years ago, but he bought the Arcam Alpha - his preference. I thought the B1 had a bit more energy and zip to it, but that's what I like. It was a cracking little amp in it's day, but whether you think it's better than those you mentioned would really be personal preference. I was never keen on the A400, so the B1 would be my choice there.
Check the serial number.....one of my customers bought one which went faulty, and when we spoke to MF they asked the serial number - which in this case was below 10, and they promptly offered to replace it with another as it was faulty - something tells me there might have been something special about those early few - either that or they were dangerous
. 'But seriously', the replacement was half the weight.....