Perhaps you should explain to your father that these computers are all relatively comparable.
The chipset is going to be made by Intel, Nvidia, AMD, etc.
This is a fact - it's all the same chipset manufacturers regardless of who puts their sticker on the box.
The processor is going to be made by AMD or Intel.
Again - a fact
The RAM - same thing - about 10 different RAM chip manufactruers.
The Video card - it's going to be NVidia or ATi most likely if not an integrated Intel card. These components aren't sony - they are another manufacturer.
Are you talking about a laptop - because alot of Sonys actually use LG (panasonic) display panels...
The CD drive will probably be made by Sony - but not necessarily. The Hard drive for certain won't be - as Sony doesnt' make hard drives.
Neither will the modem, the network card, the USB controller, nor probably the motherboard tying them all together.
The only way to get the absolute highest quality PC and components.is to build it yourself and hand pick the best available hard disk, optical drive, power supply, RAM, etc. etc. etc.
You're paying for the pretty sony box and gadgetry - but the guts are all basically the same on any of them - with not anything but the optical drives being exclusively "Sony"
Best of luck.